After buying the Heroes Within music pack I noticed two (or more, can't really tell) music tracks will play at the same time in game (not in the main menu). I've tried absolutely everything: unchecking all music packs and leaving only one, checking them one by one, messing with audio options in game and finally this morning I've reinstalled Dota but nothing changed, the music in game is still playing two tracks.

Here's a short audio sample I've recorded of how it sounds:

i3 4150
Intel HD 4400

All drivers are up to date, no viruses/malware are present and these audio issues don't happen in any other game (Steam or non Steam).