Luna here from Shopify. Sorry to hear that you've been facing some setbacks with your product pages. We can definitely take a closer look at this together.
I know that you mentioned this has issue has only started occurring recently. Thank you for that context. To gather a little bit more information, can you please let me know the following:
If the issue does not occur on multiple devices, it may be a local issue. If that is the case, I suggest clearing your cache on the browser being tested. If the issue persists on multiple devices, I will ask that you try to customize another theme in your admin. Does the same error occur? To do so, please follow these steps:
If you don't currently have any other themes downloaded, please download a free theme for testing purposes. To do so, head back into the 'Online store > Themes' section of your admin, click on 'Explore free themes', click on any free theme, and then click 'Add to theme library'. Once this theme has been downloaded, please follow the steps listed above. Once you are finished, feel free to delete the theme from your library.
This additional context will be really helpful in determining our next best steps to get this resolved.
I'm just checking in with you. I want to ensure that you get all the support you need. Were you able to resolve this issue?