Hello, I am facing this problem whereas OSTicket started receiving appended tickets already created previously. Recurring tickets are being appended on the same frequency that emails are fetched, i.e. every 5 minutes emails are fetched and same tickets are appended to old ones. Seems like OSTicket is seeing the same emails as new ones and trying to append them to tickets. I have set fetching emails to 'Archive - Move to Folder'
This is very weird because all fetched emails is moved to different folder