[NEW CHAMP SELECT BUG] You hear "parts" of the background music when you shouldn't

Thsi happened to me since the new champ select is live. Basically what i mean is that before while i was at champ select waiting others i reduced the client at icon (so the music also stopped playing).

Right now in new champ select when i reduce it at icon, you hear literally parts of the background music playing (not always, but 70% of the times)

By parts i mean literally part of the mix. Sometimes i hear the drums, sometimes i only hear the violins and stuff like that.

It's really annoying because i'm trying maybe to listen to something else and the music keep going.