Hi,

First of all, you should have set this option in Theme Setting>> Shop https://ibb.co/jrg9WFP

Please make sure that you have set the behaviour of the cart the same for both desktop and mobile from WoodMart >> Header Builder.
Screenshot for Clarification: https://ibb.co/t8R8W4M

If the problem continues then deactivate all the third party plugins, If you have any questions please feel free to contact us.

Best Regards