This is Really Weird…

So yesterday i was bumped down to rank eleven and i had no problem with it, my points were still pretty high and i could probably get back up there in a little while, and today i was bumped down to rank twelve, still had no problem with it until i looked at my points, yesterday i had 987 and today i have 915 i can understand ten points or even twenty but 72? And thats really almost impossible unless someone went through my posts and downrated them or by some stroke of (un)luck it really happened legitimately. What do you guys think?