Those bolts were abused by something. I always like to point out the guys who hit every pothole, curb, miss shifts, etc. and try to blame the manufacturer when it rattles or something breaks. Those seem to be some of the most prolific posters on the web. The saddest people on the internet are the people who believe them. Of course you need to watch out especially for the “experts’ (see above) that show up almost as often.