Why is my FBA stock wrong, stranded or stuck as reserved?
Short answer: FBA stock that looks wrong usually has one of four causes: the units are stranded (no active listing), they sit in a reserved or in-process status, they are still inbound and not yet received, or your own sync tool is writing a different SKU or count. FBA, short for Fulfillment by Amazon, is the program where Amazon stores and ships your products. Work out which cause it is by checking the status columns in the FBA Inventory page first, then your listing, then your sync tool.
Your FBA numbers do not match what you sent or what you see in your other tools, and you want to know why before it costs you sales.
I'm Ranjit, and I run Blur Studio: 15+ years building software, 120 apps taken live, and clients who have gone on to raise $10M+. I build AI systems and processes that help businesses do a lot more with a lot less time. I also work differently from most of what else is out there, more on that further down this page. Say hello.
Start with the four causes
When FBA stock looks wrong, do not guess. Open Seller Central, the dashboard where you run your Amazon business, go to Inventory and then FBA Inventory, and find one SKU (your own product code) that is off. Then ask four questions in this order.
- Is the stock stranded?
- Is it reserved or being processed?
- Has it actually been received yet?
- Is something outside Amazon changing the numbers?
1. Stranded inventory
Amazon defines stranded inventory as stock in an FBA warehouse with no active offer, so it cannot be sold. A closed or suppressed listing is a common reason. Amazon notes that you pay storage on every item you keep with FBA, stranded or not. Its fix is either to reactivate the listing or remove the stock.
How to fix it. In the FBA Inventory page, open Fix Stranded Inventory. Amazon describes it as the tool for adding or fixing listings on stranded items. Either repair the listing (a missing field, a price below your minimum, a blocked category) or create a removal order to get the units back. Do not leave units stranded to "deal with later". It is the most expensive problem in this guide because it earns nothing and still costs storage. Amazon's inventory score, the Inventory Performance Index (IPI), also counts stranded stock against you. Amazon says you need a Professional selling plan to see that score.
2. Reserved and in-process stock
Reserved units are not lost. Seller guides commonly sort them into three groups, and the FBA Inventory page shows which one applies: units held for a customer order that has not shipped, units moving between Amazon warehouses, and units pulled aside for handling, such as a removal. They stop counting as available while they are in that state, so your sellable number drops even though you own them.
How to fix it. Open the reserved breakdown on the FBA Inventory page and see which group the units are in. Customer-order units clear on their own. For the other two, note the date and the SKU. If units sit in one status much longer than the normal shipping time for that route, open a Seller Support case with the SKU, ASIN (Amazon's own product number), units and dates. The more precise the case, the faster it moves.
3. Inbound and not yet received
If you sent a shipment and the units are missing from your available count, they may not have been checked in. Amazon's FBA Dashboard shows shipment status such as "in transit" and "at fulfillment center", and raises alerts for issues like missing tracking IDs. Large shipments are often received in parts across several days.
How to fix it. Compare the quantity you shipped against the quantity received on the shipment page. If there is a gap after the shipment is marked received, keep the paperwork and look up Amazon's reimbursement policy in Seller Central. Claim windows differ by case, so check the rule for yours and file early.
4. Your sync tool is the problem
This is the one nobody suspects. If you sell on several channels, a tool may be pushing stock counts into Amazon or reading them out. Common clashes:
- Two SKUs for one product. Your shop calls it RED-L and Amazon calls it RED-LG. The tool matches one and ignores the other, so counts drift.
- Merchant-fulfilled and FBA mixed up. A sync tool writes a count into a listing that Amazon fulfills, or into the wrong fulfillment type, so what you see does not match what you ship.
- A delayed or stuck sync. The numbers are right but old.
- Listing edits from two places. A tool recreates or changes a listing and the old stock is left with no active offer, which creates stranded units.
How to fix it. Pick one SKU list as the master, with each channel's SKU in its own column. Check that the tool maps every SKU. Switch off syncing for any listing that Amazon fulfills unless you are sure what it does. My guide on Shopify and Amazon integrations that stop working covers the sync side in more detail.
Excess and aged stock, the quiet cousin
This is not an error, but it hides in the same report. Amazon counts stock as excess when there is more than 90 days of supply compared with customer demand, and it charges an aged inventory fee monthly on items stored more than 181 days. It is not "missing", but it is wrong in the sense that matters: cash tied up in stock that is not moving. Use the inventory age filter, then mark down, run a deal, or remove.
A worked example (made-up numbers)
You sent 200 units of SKU RED-L in one shipment. The shipment page shows 160 received and 40 still in transit, so the 40 inbound is right. Of the 160 received, the FBA Inventory page shows 120 available and 15 reserved. That is 135, so 25 units are not accounted for. You open Fix Stranded Inventory and find 25 units with no active offer, because a listing was closed after a price change. You reactivate it, the 25 units move to available, and 120 + 25 + 15 + 40 = 200. The method is the point: list the status columns, add them up, and look for one gap at a time.
Catch it early with alerts
Most of these cost little in week one and a lot in month three. Three cheap ways to catch them:
- A weekly check. Download the FBA inventory report every Monday and compare available plus reserved plus inbound against what you shipped.
- Amazon's own alerts. The FBA Dashboard flags shipment issues. Turn on the email notifications you are offered in Seller Central.
- A listing-change alert. Tools such as sellerboard list listing change alerts on their plans, from $19 a month as of November 2026. They tell you when a listing is changed, which is how you hear about the sync clash in point 4.
You can also have an AI assistant read the weekly report and list the odd rows. See catching FBA inventory problems early with AI for the exact prompts.
When it signals a bigger process problem
One stuck SKU is an accident. The same problem every month is a process. If you keep finding mismatches between channels, your stock lives in too many places. Fix the source of truth first, as I describe in my inventory management system guide. If two tools both write stock counts, keep one.
How I'd approach this
Do the four-question check on one SKU, fix it, then write down what you did. The notes become your checklist. Do the weekly report check for a month before you buy any tool. If the same sync clash keeps coming back, that is the point to simplify what writes to Amazon rather than add alerts on top. And if you sell on several channels with spreadsheets stitched together, a small connected system with one stock count often costs less than the stranded units it prevents.
Questions people ask
Why is my Amazon FBA inventory not updating?
Most often the units are in a status that does not count as available, such as reserved, inbound or stranded. Look at the status columns on the FBA Inventory page. If everything adds up there, check whether a sync tool is overwriting your counts.
What is stranded inventory on Amazon FBA?
Stock in an Amazon warehouse with no active offer, so customers cannot buy it. You still pay storage. Amazon's Fix Stranded Inventory tool helps you add or fix the listing. See my FBA inventory management guide for the wider routine.
What does reserved inventory mean on FBA?
Units set aside and not available to sell right now, usually for a customer order that has not shipped, a move between warehouses, or handling such as a removal. They are still yours.
Why is my FBA inventory not showing at all?
The shipment may not be checked in yet, the listing may be inactive, or you may be looking at the wrong marketplace or account. Check the shipment status, then the listing, then the account selector.
Can a sync tool cause missing or wrong FBA counts?
Yes. Mismatched SKUs, two tools writing counts, or a listing recreated by a tool can all cause it. Keep one master SKU list and make only one system responsible for stock counts.
How often should I check FBA stock?
Weekly is enough for most sellers. Stranded and stuck units cost more each week they sit, and a weekly check is small enough to keep doing.
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