Sounds like you got yourself a bush pheno. As Tshirt said, you can expect to see about three phenos. The bush, the normal single cola with 4-8 side branches and the occasional runt. Autos have only been around for about 5 years now and are not fully stabilized. In the future I expect you may see 2 phenos offered on a lot of seeds, short and tall. If you've got room the bush phenos are always the biggest yields.
Photo plants have been under development for over 30 years now so for the most part, have been stabilized.