It's been about a month since I got my new rims put on (alloys), and I noticed last night that I was missing a lugnut from the right rear rim. I put another one on, and tightened up the rest, checking all the wheels. The front two rims were locked down solid, but all the lugs on the back were kinda loose. After re-tightening the back ones, I've noticed that my left rear brakes sound like they're rubbing. This doesn't seem possible, but could I have over-tightened a lugnut and damaged something? I did it by hand, and they're still not as tight as the nuts on the front wheels. Any ideas? Everything was fine until I tightened it back up.