Properties do not get translated.

On our multilingual website we have a lot of products where we created custom attributes within WooCommerce properties.
Unfortunately, the attributes aren’t applied to the other language when edited with Bulky. We always save after editing. Strangely, product categories are applied to the other language. All strings have been checked whether they’re translated (in WPML).

We are a little lost about where to start with the troubleshooting. Is there any multilanguage setting that we forgot?

Thanks in advance for your help!

Kind regards,

Patrick