I am having the same problem... the 22ml was to short and so the ball at the bottom went up, then the 24ml the ball at the top went down slightly in to my tongue so I got a 26ml and a bigger ball... Now it seems that my tongue just stretches to allow whatever size ball I have in...
I have never had this problem before just this once, I don't know what to do. I have nurofen and 500mg of antibiotics as doc thinks slight infection... I don't think my tongue will heal though if the ball keeps going in slightly but it don't matter what ball I put it, it just opens my tongue for it :(