sergi_pinto
No, typically when this happens two emails were processed at the same time. We do not lock the ticket number on creation so if two tickets get created at approximately the same time from different methods then it will have potential to share the same number.
This can happen if you have cron running at a short time and it’s not able to process all mail on that single request before the next cron runs. Or maybe you have Cron Job enabled but also Fetch on Auto-cron; f you have a cron job you must disable Auto-cron for this very reason. You could also be piping and fetching and just so happens to trigger at the same time.
Cheers.