Shuffle broken when connecting to speakers?

[Ethaaaaaann]

So I have 3 speakers in my house, two WiFi enabled and one Bluetooth. Whenever I use these speakers the shuffle on my playlists messes up. It will only play songs which are by artists beginning with the same letter (or up to 3 away) as the one currently playing. For example if I play a song by the Arctic Monkeys the only artists which will appear in upcoming will be those A - C. This is incredibly frustrating when I have artists A through to Z as I cannot listen to them! What kind of shuffle is this?!