I see so your not actually wanting to make it shorter your just worried that there is something wrong with it to have grown so big? lol
nah I think its one of the healthiest plants Ive seen on here.
hopefully those nugs fill out nicely, get a budscope to determine harvest so you dont cut it down early, 60 days from seed? you could probably let it go longer than that for best results but I dont really know anything about it