I prepare my ATS shipments weekly.

Since last month, whenever i send goods to the LKO1 FC. Some of the inventory is always missing. Now i know i have sent the right quantity. I am triple checking before sending the shipments. If i am sending the right quantity and Amazon says they have not received the right quantity. In that case, what is happening?

I have lost my goods and affected my Inbound performance without doing anything wrong.