Why don't items collapse when added to the cart (Bitrix)?

Question

1C-Bitrix

Good day. I encountered such a problem: on one site, when you put the same item in the cart several times, it is added each time as a new position, instead of increasing the amount of the item already in the cart. This is not typical behavior. There are no cart properties.

Answer 1

see what the goods have in the table b_sale_basket_props