Early flowering issue

it's a genetic abnormality... Iv'e seen it happen with a Purple Gelato I had.. It wasn't an auto plant but it did the exact same thing as yours. My best educated guess is that the flowering hormone was/is being made by the plant from almost the beginning in her life cycle. because of this she will Flower/veg then flower.. If I could describe how she grew it was with a lot of new Tri finger leaves(unique to growth of leaves in flowering phase) and she was short and stout.. She stretched about a feet out then went hard into flowering/bulking.. If this sounds like what you had then now you know a bit more of info.. But it was a genetic factor in my case and it could most likely be in yours as well.