MMMM not rampant...you might have a different one than mine ;-) ....
Mine easily grows 10-15 ft in a season..with many branches reaching out like that.. Mine is in a container also
12" x 12" x 12 ft long...the roots grow to the full extent of the container...so it figures it can grow as much as it wants up top... That might be the difference in the way they seem to grow.
I bought mine as a pink jasmine..From an online grower without a clue......but with some lovely plants