RT GSync: Google Calendar, Contacts, Drive Sync

Hi, Using Sugar 6.5CE. We discovered that some contacts we created automatically and even after suppression they were created over and over again. I think it's coming from RT GSync. Is RT GSync creating contacts for all invitees even if they are CRM Users ? For example : User A is not using RT GSync. User B is using RT GSync. -User A create a meeting with a lead and assign it to User B. -By default, User A is an invitee of the meeting because he is the creator of the meeting and User B is an invitee of the meeting because he is the assigned user. -So both users A and B are invitees. -At this point, a contact is created automatically in Sugar (by RT GSync) with the same email as User A (the creator of the meeting) with a name that it not always the same as the User A (I don't know from where the name is sourced). The meeting is also related to that newly created contact. -If I delete the contact, he appear again a couple of minutes later (I guess at next sync). Is there a way not to create automatically contacts when they are already users ? Thanks, Jonathan