Plant height is certainly dependent on strain and genetics, but it can also be dependent on other factors as well. Particularly lighting and training. I have a Durban poison (a pure sativa) that I flipped 3 weeks ago and it is only 24 inches tall, dirt to tips. It is short because I’ve put a whole lot of light on it during its 7 weeks of veg. Supercropping cut some inches off of its total height too, but I attribute most of its shortness to the intense lighting I put on it.
Yours isn’t very far into flower and should add quite a bit of size over the next few weeks.