Incorrect drill diameter for Molex 5569 Mini-Fit Header library in Cadsoft Eagle?
One can never rely on anyone else's libraries unfortunately. Even the default libs may be 95% accurate. If you get something close, then great, saves you a little work. But it's par for the course to go through each component, each pad, and make sure they match up with the datasheets. Even DIP and SO components... I've seen soldering a SO16 be a nightmare, because the default library width was one thing, and the chip width was slightly wider.

Just get into the habit of making your own libraries. After using and testing them, you'll be 100% assured anything in it will be spot-on.