I can see the issue you mentioned. However, I also checked randomly this one hidden link where related products seem to be correct.
I then further checked for Watches category on below URLs and can see some rings included in the results. I am not sure if that's intentional, but perhaps that is matching somehow to the related products?
hidden link hidden link
Anyways, before proceeding further, may I ask you to try the following?
IMPORTANT: Take full backup of your website and database beforehand. It is highly advised to try the following on a staging/dev site first, so your live website isn't compromised.
- Deactivate all plugins except WPML, WCML and WooCommerce and check for the issue.
- Activate each plugin one-by-one, while keeping check on the issue after a plugin is activated. This way you'll be able to pinpoint a plugin having a conflict (or problem), if any.
- If the problem persists, repeat the above steps with a default theme of WordPress (i.e. 2021 or 2023).
Please let me know your findings and I'll try my best to further help you on the matter.