It started just a couple of weeks ago. Some whales are countering the votes of other whales and large groups, to distribute the power in a somewhat more linear fashion. The problem is that if you have 10 times more steem power than someone, you actually have 100 times larger vote. Similarly, if you have 100 times more power, you have 10,000 larger vote. So whales had extremely disproportionate power which is finally being reduced, but it needs to be actually built into the protocol instead of being applied ad-hoc by some whales.