Hello,
First of all, please make sure that all those products you have uploaded are perfectly published, If no then published those products again and check back after removing the browser cache.
This seems to be your Import issue, This is not the Theme issue, For making it sure can you please check once with activating some default WordPress Theme like Twenty Twenty and check back after removing the browser cache, Is it working for you or not, If no then it means that is the Import issue and you have to contact the Import plugin Author which you have used for Importing the products and if yes then please share your site WP Admin Login details in a private content area of this topic with permission to debug your site which includes deactivating all the third party plugins and on site Customization as well. Take the complete backup of your site first.
Best Regards.
.
