Hello,
You can resolve this by editing the page and adjusting the Categories widget. Please check the following:
1. Make sure the data source is not set to a custom query—if yes, select All Categories instead.
2. Ensure that “Hide empty categories” is disabled if you want all categories to appear, even those without products.
If the issue remains, share the WP login details so I can further check on your site and give you a possible solution.
Best Regards,