Mosherd7answered grow question 4 years ago Can't tell exactly from your photos, but I'm gonna go with rootbound. There is no space between nodes but your plant looks like its trying to be big and healthy.
Your plant will only grow to a height in proportion to how deep its tap root can dig. It looks like your containers are very shallow. Looks like a 1L square container that like 6-8 inches high, with soil not even to the top.
If thats the case, repot to a bigger and deeper plant pot. (Also, don't bury it deep or this will happen again shortly after)
Good luck!