Im not sure whether is this a bug, but other gamemodes appears in osu! mode which is abit irritating when i choose random and it chose a song that is in another gamemode, strangely enough, it does not have this problem if you were to play in other gamemodes other than osu!
osu! version: 20170503.4 (latest)
osu! version: 20170503.4 (latest)