You're seeing the beginning of a return to what was normal when I started. The 50/50 split is 50% Steem Power and 50% liquid assets. The liquid assets were normally split between Steem and SBD, but the spike in the price of the SBD led to 100% SBD payouts to correct the market in an effort to return the SBD toward parity with the US Dollar, or at least that is how I understand the algorithms to work.