The fact is that you have 2 "Select" fields displayed in the interface:
Checkbox - works when you click on it and in parallel puts the number of selected products (the second field is "Select", where the quantity is indicated), and then the product table is updated and, according to the standard logic, the number of unshipped or unreceived goods is written in the select field , and your goods have already been credited
https://prnt.sc/uy3ix6If you want you to always set manually, then you need to check the
https://prnt.sc/uy3j9c checkbox in the table settings Then you will