Hello midnightroses
Thank your for your reply.
I see that you have purchased a theme that comes with the feature to disable users to view single-page products and set the layout of the shop page to be fixed.
May I ask what is the name of that theme?
Also, could you edit the product go to Short Description, and then share a screenshot?
Another possibility is that your site’s theme may be removing the HTML characters from the Short Description. It would be helpful if you could contact the theme developers and ask them about this issue.
I will be able to guide you further once I have more information. ??
Best regards.