This weird case started to occur after the August Release. This is the situation:

• The user is member of some groups. Example:
  • Example1 belongs to Group1(bugged), Group2 and Group3. Example2 is member of the same groups.
• You remove the user Example1 from the group Group1 through User Browse(Studio Jira). No matter if you do this through the User edit or Group edit screens.
• The user is removed from the group on the cwd_membership on Crowd database, but not from the cwd_membership on Jira db.
• Sync Jira with the remote dir(Studio Crowd) will not update the membership on Jira;
• It occurs with a specific GROUP. If Example1 and Example2 got removed from the Group1, the same thing will happen. Group2 wouldn't reproduce so, isn't a behavior "spread" on all groups or focused on a specific user.
• You add them again to group1. cwd_membership is updated on Crowd however JiraDB remains untouched.

In other cases the membership is duplicated on Jira database.