Chrome + 68.0.3440.106 (Build oficial) (64 bits) Windows 8.1 This is an odd bug and not really a big issue, just an annoyance. But since it has happened to me more than once and it's really easy to reproduce I'll just post it here. Whenever you have the "Add Track" window open and you are playing a sound from your playlist, If you move the sound to another position (inside or outside the playlist) it will be duplicated. This has happened to me more than once, since I take the time to prepare as many songs and FX as possible before a game, so moving things around while still having the "Add Track" window open is common, as it is replaying stuff over and over. Playing any of the clone tracks will reproduce both tracks. Deleting anyone of those will remove both tracks for good, so you either deal with having duplicates or try to find the sound again. But that's just my OCD talking.