is this from seed or clone? Also, how old are the seeds? I had this happen with SS Bubblegum after cloning it.
the amount of light you’re feeding it can factor, I’ve had a few Strains that will throw preflower under fluorescents. Under a 400w MH it would grow as expected. It willoerr Out just fine but you likely won’t see the usual stretch since it’s already thinks it’s in flower
About 10 years ago they were having this problem, Simons rep (on another forum) offered to send me a batch of AK