Why are there duplicate items in the cart?

Question

opencart

When I logged in to the personal account of the store on Opencart, and then added goods to the cart, for example, 1xPen, 2xLights, then I log out of my personal account, and log in again, the cart will automatically show 2xPens and 4xLights and so every time.

Answer 1

look at the scripts, the automatic doubling of goods may have been lost somewhere, check which Ajax requests are sent during re-authorization