A tiny problem with size!

snap a stem without severing it... support it so it doesn't dangle and damage itself worse. within a day or 2 it'll have a knuckle and you'll be holding back vertical growth instead maintaining it horizontally while it heals. It will try to bend upward around that break again.. hold it down, let the tip go vertical if timing is good and won't run out of space again. rather not break it twice if you can avoid it. this is called HST - can google for examples. it's simpler than it sounds. i just grab and push forward with my thumb until the stem doubles over -- only enough force for that to occur then stop. support it so it is horizontal and heals easily. it heals fast. shortly after it'll try to arch upward. hold it down at a point you feel safe the upward growth won't run out of room a 2nd time.