Right, so I tried to use only auto-organise only or auto-sweep only. In both cases, the issue persists and MB seems to think that for some random files, there are two files in stead on one. Here are the steps:
1. I add tracks to a monitored folder called 'J:/New Music'
2. The tracks are added to the Inbox
3. I send the tracks to the library with auto-organisation on
4. The tracks are renamed and sent to the 'J:/Music' folder and renamed following the <Album Artist>\<Album>\<Disc-Track#>-<Artist>-<Title> template
5. Some random tracks are then sent back to the Inbox as if there were two tracks for each one of them, one named track and the other track_1
If I stop monitoring the J:/Music' folder the tracks are not added back to the inbox.
However, I would like to get to the bottom of why some tracks are affected by this whilst the majority are not.
Any ideas?