Damaged Leaf - Problem Identification

Almost certainly caused by overfeeding. You shouldn't be feeding auto's at all for the first few weeks & why bloom from week 2 ? Your plants aren't in flower yet & don't need it until they are. Remember, autoflowers only need a percentage of the feed of photoperiod plants. Try looking at some successful diaries of the plants you're growing. Good luck

Nothing to worry about, it doesn't look like pests. Very difficult to decipher what could be the cause but sometimes leaves just grow strangely and most times you don't notice it.