01. 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 let me know I will further check on your site and give you a possible solution.
02. You are using a custom layout for archive pages. When Custom Layouts enabled Archive pages which is why your made changes under the Theme Settings aren’t taking effect on that. Navigate to Layouts > edit layout and remove the page title widget from the layout.