Please deactivate all the 3rd party plugins and activate only theme-required plugins on the site and then check the issue. I am sure your issue will be solved. Then Activate the 3rd party plugins one by one and check which plugin is creating the issue for you.
Otherwise, if the issue still exists then keep the 3rd party plugins deactivated and share the wp logins details so i will check and give you a possible solution.
Sorry to say that your given login details are not working, please share the correct login details of your site. So I will further check on your site and give you a possible solution.
It is an issue with taxes. Navigate Products > Edit Product > in the product data section select the option none in in tax status: https://ibb.co/rtXWHs0