SugarChimp

I sync Mailchimp Groups to a custom field, TargetGroup in contacts, targets and leads in SugarCRM. During one import into Mailchimp, some additional groups were inadevertently added to some Mailchimp contacts and synced to the TargetGroup multi value list.. Now I want to delete these incorrect groups from both Mailchimp and Sugarcrm. What I have done is the following: 1. Make the schedules SugarChimp and SmartList Inactive 2. Delete the groups from Mailchimp 3. Delete the groups from the MultiSelect field behind TargetGroup field using studio 4. Make schedules SugarChimp and SmartList Active again At the next sync the additional groups are added, both to the Sugar list and Mailchimp :( What am I doing wrong?