Quantity, combinations not updating from backoffice

[USB83]

Hello,

Lately i've been having weird things happening on a shop running v 1.6.1.24

For example, when I reload the product edit page after changing the available quantities, nothing changes, i still see the original quantities as if I didn't change the quantities.

When i check on the ps_stock_available database table, I can see that the changes have been saved, i can see the correct quantity on the product page, i can add the product to the cart, but on the product edit page on the backoffice, it still shows 0.

 

As for combinations, changing those has no effect.

If I create or edit existing color/size combinations, after pushing the save button and reloading the page, it is as if i didn't change anything.

 

ps : I'm using manual quantity settings, no multi-store, no advance stock management.

Any help is welcome.

Thanks