Question how to solve this problem related to the Inability to update my WordPress basket

[Blooddiner]

Hello, for two months, I created a store site in host on plesk. The problem I have is this; I can't update the products I add to the cart. If for example I add a product to the cart and I want to increase it to 2 or 3 the update of the cart only keeps the first product added without updating the number selected.

NB: The local site works well and without any problem, all these update actions go well locally except the online deploy site.

 

[Bitpalast]

Similar behavior occurs when using Elementor in combination with ModSecurity (Web Application Firewall). When users edit text, they cannot save the edit. I assume that the behavior of the basket has a similar reason: The way the data is stored offends a ModSecurity rule.

To verify this, please look into the error_log of the domain. Do you see any 403 errors with a "ModSecurity" text? In that case, identify the "[ID ....]" section in that error message and add the ID number to the exceptions of your "Web Application Firewall" (icon on the "Websites & Domains" tab). Allow several minutes for the change to take effect, because the web server configuration might need to be reloaded afterwards for it to take effect.