Please open a Product for editing in the original language and make sure the following options are enabled in the WPML Language widget (on the right side of the screen). If not, enable it and update the product and its translation. Then make sure the bug exists or not.
Media attachments
Duplicate uploaded media to translations
Duplicate featured image to translations
If the problem remains, please try the workarounds suggested in the following ticket after a full site backup.
Thank you for the updates. Please try the workaround suggested in the following ticket after a full site backup {mandatory} and ensure you are getting the expected results.
Thank you for the feedback. Happy to know you are getting the expected results now. It was happening because the following *Media attachments* options were not enabled for the products.
* Duplicate uploaded media to translations
* Duplicate featured image to translations
It should be selected, then only the images will be synced to the translations. Please visit WPML>>Settings>>Media Translation and make sure it is enabled. So it will not happen for the newly added products or posts.