Hi, similar to mini lop1, when my Bailey got neutered he also went naughty afterwards. I kept thinking what have I done, he kept humping like mad, considering he had just been done, you'd of thought it was sore.. But nope and he would charge at our ankles which he never did before. He would also go digging at his hay and our fake coal from our gas fire (never ever use it) but about 6 weeks after he just became so cute and a different rabbit. don't get me wrong he's still a very cheeky little bunny and has his naughty moments but has never charged at us since and loves following us everywhere, plus we have loads of kisses and he loves licking us. He's one of the most affectionate bunnies I've had.
Hope this helps xx