I had the same issue, at first I would just go into the beach and turn around the opposite direction until the twists were out (with kite at 12)
Soon I learned to downloop while turning (you will find this is from the tack you cant backroll on to the tack you can) to undo the lines
Now, I backroll both ways, sometimes I don't even unspin the bar between them (when just practising rolls both directions)
Good luck, its always fun though.