so the stopper should be laying down not standing up??? mine has to be standing up cause if it lays down like yours there is a gap and air gets in. and trying to get it to stand straight up is no easy task either. i am supposed to be getting a new stopper but i am not sure that is the only issue. the top ring in my heater cover has a small dip in it when you run your finger around the rim. so you had to turn it up to the max to vape flowers?? interesting... and you left the cup in while doing it.... also interesting. i had issues with flowers... maybe i had the heat too low. i had it set at the same temp as when i use to vape flowers with the standard heater cover.