Audio Cd playback and weird window

Hello all, please try this:
Play an audio CD using Kodi. While the CD is playing, press “play” on your remote. A window pops up. it has no title, just a “cancel” button, and an empty zone that seems to be for some kind of list. I don’t know its purpose and it seems unuseful? Is this a bug?
By the way, how can I submit bug reports to the Kodi team?
Thanks,
G