Parts Library Strikes Again
Here's a little bit of a parts library or wrong package problem. I'm not exactly sure how it happened. The board may have been laid out for a small QFP footprint but then a QFN part was purchased. The footprint looks like that of a QFP, but QFNs are usually smaller, so it may be a custom made part library with some errors in measurement.
It's surprisingly easy to do that; especially if the person making the library part isn't the same person that's using it. Maybe the person drawing the footprint only had part of the dimension information for the QFN. I can easily see how someone could take the outside dimensions of the part and the pitch and then come up with something like this based of years of making QFP footprints.
The lesson is to always double check the component fit before sending a board out for fab. In this case, the lead pads are so long that they would short every connection to the ground pad in the middle. Oh, and there's also that giant open via in the middle of the center pad. That's not a good thing.
Analysis, Mr Schlock?