Looks like other people covered it. The payout formula is set assuming SBD is pegged to the dollar which it isn't and assumes that Steem is floating. The higher Steem gets the less you will get.
A month or two ago when both SBD and STEEM were about a dollar you would get equal amounts of both. We are still doing good though because the payouts are higher then is shown due to the high price of SBD.