For January, I have gotten all three medals every day so far, but the Calendar view shows me as being 0/3 for every day except for the 1st and the 31st (!!!) where I show as getting the daily medal bonus. This makes no sense.
Also, if I view Monthly Prize History, it shows me as having no prizes (I also 3/3d every day in December) and also lists October then November then December then December again. O_o
I work at MS and can bring the device over if interesting.