Autoflower small and preflowering already

I responded to your PM but it never sent? Yeah based off these photos it has started flower/preflower. This is when the plant will stretch, how much... who knows?! Each and every strain is different my friend, even the same strain can have different phenos that vary. I have 4 Mango smiles running currently, 2x are 16-17inches and 2x are less then 10inches. So it can vary growmie. Hopefully these will stretch decently for you. If not you will have a more squat plant. This is a unfortunate part of autos, some are just small.. and if their not you can make mistakes which will make them small. The first couple things I would say that possibly would of caused this is genetics.. if not genetics, then the soil was to hot stunting them. To strong of a light or it being to close to the plant. Finally LST, it will slow the vertical growth with these plants. I highly recommend you never do lst until the plant has 5 or 6 nodes, at that point it also needs to be 6 to 8 inches tall. If the plant isn't 6 to 8 inches tall, but has 4 or 5 nodes already then it's a tale tale sign the plant is either a short plant or you stunted it with the reasons I listed above. So don't do lst until it's stretched up some. If that makes sense. . If you recognize it's a squated plant let it grow vertical and then slightly pull out branches to let light in, because if you tie down a already squatted plant, then it's going to be a tiny baby. Alright man I hope this helps, I would make sure your not giving it to much light, or feed. If those two things are in check, then it's unfortunately going to be a small lady and you will just have to hope you learned how to possibly prevent it next time. Even if you only get a ounce of bud, its still a Oz of bud and look at all the first hand information you've gained! That's the important part.... information is the name of the game!