This list has been somewhat useless ever since the introduction of maps that are bound to the client when you download it - it never changes except for one or two maps once in a while and then it goes back to the same maps.
This happens, of course, because they are the maps that the client has by default when you download it, so why don't we remove them from this list, so we get a real "most played beatmaps" list (or at least a better one).