Hello from Amazon Selling Partner Support,
We understand you're having issue about FBA inventory in reserved status for FNSKU X003FBTMT7.
Please find our investigation outcome below.
45 of your items are being shipped between fulfillment centers to effectively manage storage and create the best availability for customers.
Transfers may take up to 22-25 days to complete, but in some circumstances (for example, delays due to Covid-19 restrictions, weather conditions, and so on), transfers may take longer and additional investigation may be required. During this period, customers will be able to place an order for these items. Customers may be shown a future ship date if no other units are available for immediate fulfillment days.
To see more details about reserved inventory in transshipment, go to: https://sellercentral.amazon.com/gp/help/G201723860