Thanks for this report, looking into this now. Is this every time you launch the game?

Just to update here that we are aware of the issue. https://trello.com/c/NlancjO2/748-controller-ui-present-in-mobile-despite-controller-not-being-connected I wanted to let everyone know that this is just a visual issue and matchmaking will still put in you a mobile lobby. This is due to the fact that you still have to press "start". When using touch input to enter a match you are entered into the mobile matchmaking lobby.