Quantity bug when updating products with combinations?

[DDD]

Hi,

I run my Prestashop on version 1.7.6.5 at www.drakfisken.se

I allow orders of out of stock products.

If a customer orders a product that is not on stock I get 0 Physical Stock, 1 ordered and -1 available which is correct.

But if I then update the ordered product somehow I then 1 in Physical Stock, 1 ordered and 0 available.

This only happens with products with combinations. Other products work fine.

What could be wrong? How can i fix it?

Thanks!

//Hans