Hello,
I have checked your site as a guest user, and all products are accessible and load their respective product pages correctly. I was unable to reproduce the issue you described.
See Screenshots for clarification:
https://postimg.cc/dDjh6Nt1
https://postimg.cc/xcscDkzp
If you have another behaviour, share a small video for better understanding to reproduce the issue on your site. Also, share your Site WP-ADMIN Login details in the Private Content field so that we can check this concern on your Site and help you out accordingly.
Best Regards