Short LSD auto with deep purple core

Purple is simply genetics. Short stubbiness is possibly combo of a lot of variables. Autoflowers suck being the main contributor there in my most humble of opinions.

light was too intense. (internode length is tiny) the purple could be genetics... could be cooler temps too... if it's not boing below 68F, more likely genetics. plant doesn't care if the vaiables are all the same but it cannot handle those things as well as the next plant -- genetic variation. So, observe and react... being consistent like that is a good thing... it allows you to react in a more useful manner over time, but don't think it guaranteed a specific result. it's a ballpark idea that saves loads of effort. secondly, no matter how hard you try, there are always differences even if not genetic. this is why research with any integrity has very large sample sizes appropriate for the probabilities at hand... more variety of results requires a larger sample

What you can do. Because the internodes are sooo tight. You could leave it turned on its side to expose some of the lower covered flowering parts to the light.