This morning, my character had healing rankings for the first 4 bosses of Mythic Eternal Palace and was associated with a guild run on 12/3. When I look at my character profile right now, those rankings have disappears and the association with that run on 12/3 is gone.
It looks like the guild that I ran with, Frauds on Zul’jin, has also swapped faction from Horde to Alliance on warcraftlogs.com for some reason, and their entire calendar has been wiped clean. I assume the two issues are linked.