slow topped white berry on one stem pics!

hi guys, i just wanted to put this is to see if anyone had had a stem grow like this before. shes about 2 weeks into flower and three of the stems are doing well. one of them though has got three branches around each node and its lagging badly, the plant seems to be putting all its effort now into the other stems. will it catch up?

thanks
lu

what size pot is it in? MB you should take the top out and let the other three become friggin huge colas

thanks danny thats what i was thinking, i was was just take the whole thing out. the other three are doing well and i think they would only be hindered y the little one.
they are in 15l pots, so no root issues, looks weird though ive never seen three branch nodes b4.
thanks for reply
lu