check underneath your leaves for bugs or eggs of bugs. You'll need to look close, using a magnifier of some kind even to be sure you dont have bugs or larva eating the leaves.
Could also be heat spots from the crinkles in the tin foil, or maybe splattered nutrient solution on the leaves that created a heat spot... something along those lines.
As for why the growth is so compact, it just looks like a lanky plant thats flowering at a pretty young age. She wasn't given the time to have internodal growth prior to flowering, so all your flowers are growing compactly against the main stem, instead of on one of many side branches you'd usually see on a plant that had longer vegetative growth cycles.