It may be related to the
2011 MAP norms that were recently released. They are largely similar to the 2008 norms, but percentiles tend to be a little lower at the high end of the scale under the 2011 norms (IIRC there are comparison curves in the PDF file). AFAIK the changes don't affect the raw scores, just the percentiles that are generated from them.
ETA: Fall math norms begin on page number 64, which is actually page 78 in the file. You might want to save this file, as it might not be publicly available forever.