Multistore stock problem on 1.7.6.6

[_zbik9]

Hello,

I'm running Prestashop 1.7.6.6 in Multistore mode and having strange problem with stocks.

My configuration:
- sharing customers: YES
- sharing stocks: NO

If customer in shop B place an order everything validate properly but products are subtracted also from shop A stock. This situation is even if products in shop A are inactive. I can't find cause of that problem and to make things worse it's not occur on every order. If anybody have some ideas I will be grateful for informations.