Pick Number vs Stock

Hi Guys.

I am getting this error with one of my client, can anyone help me on the below Please…

While preparing the delivery order ( ex. 1011), the user is getting problem with the pick on the document (ex pick PK996) on an Item No. (ex. Item F3013).

The order shows 10 unit in stock, and when doing the pick, we selected 8 PCs. Now when transferring the unit from PCs to BOARD, it is giving a quantity of 10 (instead of 8).

I would like to know why the sample does not indicate a quantity of 10 PCs ?