Lemon Haze Auto

plants have been looking great, the one that's in full in flower is only 8 inches high.... very busy with multiple bud sites developing, did mild lst on main stem for more bud sites to get like really responded well to that. the slight smaller plant I believe is only at week 3, cannot remember exactly though, growing nice and fast, think they might have a little nute burn, just gonna give them 25% nutes from now on and slightly less water, my soil dries out quickly however I water until runoff and nothing more, but when I check on them later they look slightly overwatered, so idc about runoff anymore, gonna only water them by feel... If anyone has any insight on why this 6 week old is still so damn short or if it's gonna get continued height lmk because it's puzzling. thank you all!