I read the chat conversation carefully and understood that when disabling WPML the issue is gone. So, I agree, WPML is part of the problem. But, I think there should be other component involved.
That's why, if it's possible for you to do the following test:
I suggest you try this to help us identify if it might be a conflict with another plugin or theme that is causing the problem.
**IMPORTANT:** Please try this in a staging environment or at least with a backup of your site files and database before continuing.
Disable all plugins except WooCommerce and WPML-related and temporarily change the theme to a default WordPress such as Twenty Twenty-five.
Is the issue resolved with these settings? If so, please reactivate one by one to see which conflicts.
Enabling the WP debug may also help us to isolate the root cause of the issue:
Please follow the instructions mentioned on this page: https://wpml.org/documentation/support/debugging-wpml/
Then, try to reproduce the issue and check your installation's **wp-content** folder to see if a file named **"debug.log"** was created (it will only be generated if a server error occurs).
If the file was created, please upload it to a platform like **Google Drive** or **Dropbox** (whichever you usually use) and share the link with me (make sure it is publicly accessible) so I can analyze it.
Let me know your results, please.
Best Regards,
Otto
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