The TPU stats are showing game dates incorrectly. I'm not sure when this started, but since it seems to affect even stats archives from previous years, I'm investigating the PHP component of the stats system.
Hopefully I can fix this problem without losing any stats data, but I can't make any promises right now.
Sorry for any inconvenience.
UPDATE: As of 2016Mar13 11:15am, the problem seems to be resolved.