Interesting groups

I’m using mailchimp to sync WP-users with mailchimp.
Everything seems to work, except the selection on “Interesting Groups”
I used WP-members to add extra fields on the registration-page. These extra fields are mapped on the Mailchimp Interesting Groups.

When selecting these fields, the interesting groups are correctly stored by registration.
The problem is to change these values. When you uncheck the fields on de page to change user settings, the uncheck-change isn’t synced with Mailchimp Interesting Group.
When you afterwards recheck the checkbox, the mailchimp Interesting Grroup is deleted.
It seems that only a status-change ‘uncheck-check’ is passed through to Mailchimp.

How can I fix this?

https://wordpress.org/plugins/autochimp/