I am having the same problem as ghfhfgg. Unfortunately I am not at home right now so I cannot prove my claims but since ghfhfgg has provided his own story I hope my testimony will not only corroborate his claims but that I will also receive some help.
Last night I had a 1390 ranking on the Dream World OU and sz had 1391. I wanted to be number 1 again, so I understandably queued up against someone with a German sounding tag (DasNachtFuchs or something) with, like ghfhfgg said, a ridiculous variation (+54, -45 or thereabouts. Maybe because my "ranking" was -1/X?). I won the battle and, like ghfhfgg, my rating didn't go up a single point.
I then asked a mod about it and he said the rankings being bugged were a known issue. However, the mod said that he had never heard about a ranking no changing at all after a battle. I then decided to test out the system on another ladder, the Standard OU ladder.
I lost my battle on the Standard OU ladder and, sure enough, I lost a reasonable amount of points when I checked my ranking. Convinced that my first experience was a glitch, I queued up for Dream World OU again, this time against someone named Komoku or something like that. I won again, but the first red flag was the variation was something crazy again (+40 something, -40 something). The second weird thing was not only did I not gain any points, I actually fell off the rankings page. Now Keatonz is second and I literally cannot find where I "dropped" to.
tl,dr: I have the same problem as ghfhfgg, weird variations and all. In my first won battle I didn't change ranking and in my second battle I fell off the rankings page entirely. I hope this corroborates his claim, which he substantiated with pics, and that I receive some help as well. Is there anyone in charge of the rankings that can rectify this, or will the server magically rectify it when it resets?
Thanks for your time.