Second Taxonomy Field Not Saving

Hello,

No, you can assign a post to many different taxonomies as you want, there shouldn't be an issue in this case. Can you please export the field group to a JSON file and share it here? I will check it on my end.
Please read more on the documentation https://docs.metabox.io/extensions/meta-box-builder/#export--import

I have same problem

I added two custom field which are same taxonomy into User page.

And when I select one,

But second field is also saved..

I think this is error.

Hello Yoon,

The field taxonomy set the post terms so it does not work with the user. If you want to use it as a user meta, please use the field type taxonomy_advanced.