Leaf colour

Could also be that that strain has a few different pheno types . Same strain just some might look different .

It’s ment to be gorilla skittles this is the only one that looks like this I have got a random seed in my pack

Could be cos it’s a indica strain a lot of them the leafs turn purple

Can be genetics; can be environmental. Best guess, it's a bit cold after lights turn off. Did the temperture drop to ~18C or lower? ~mid 60s F etc... if so, this will often cause autumn colors to display in leaves -- just as it happens outside, it is temperature caused. Some will just turn wild colors as they near end (senescence). See a flippin' rainbow on the exotic ones.