Hello,
I have set the product pagination to Infinite Scrolling, it works fine when we open the /shop page, even when we click any child category’s last node on categogory menu.
But when we access the product grid from Category Page, then by clicking any sub categories to reach the product list, it shows “Load More Produts” button (once) instead of infinite scrolling and then once we click the load more it continues to infinite scrolling.
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 admin login details of your site so I will check and give you a possible solution.
I’ve inactivated almost all unnecessary plugins. Only a few left because disabling them, functionality of website will be affected. But unfortunately, no success.