Why is the user's shopping cart buggy?

Question

PHP

Good afternoon!
Bitrix 15.5, standard components of the cart and catalog
If a guest adds items to the cart, then these items are in the cart of another registered user.
and it may be that I, as a guest, add one product - this product is added by two different users, then I log in again from another browser as a guest, add it again and the product appears already with another user.
If you throw goods into the basket under an authorized user, then a similar problem does not appear

Answer 1

Something is wrong with the sessions, one session is created for several visitors.