We have a really weird issue.
Customer claims he cannot remove items from cart. It appears the customer is right because we can't even delete items from his shopping cart in the admin panel! No error or nothing, just jumps back to the customer list overview, and then when you re-view the customer's shopping cart all the items are still there.
Please check with following controller first:
After click on delete button of cart item, try to debug with execute function is working or not of this controller. This file use for delete item from customer cart.
You can debug with this controller and resolve issue.
If issue resolve, please click on 'Kudos' & Accept as Solution!
There might be following possible reasons :