I want to link the English and Spanish versions of products to get the hreflang but when I do it changes the custom field values on the English product to Spanish.
Is there any documentation that you are following?
No
Is there a similar example that we can see?
I would have to show you what is happening. Can we do a screenshare zoom session?
before your ticket is assigned to one of my colleagues, please allow me to walk you through some initial debugging steps. This will help speed up the support process.
Please note that we can't provide support outside this public forum. As I do not fully understand your exact issue, please give a specific example with screenshots or a screen video.
Thank you for contacting WPML support, I'd be happy to help you with this issue.
According to the debug info, I see the default language on your site is "en-us". You are editing the product and connecting a translation in the default language, so you should check the box "Make English the original language for this product" when connecting the translation.