Receiving payment in SBD, SP and STEEM for the first time. Anyone know why?

So ever since I joined Steemit my payouts we're all made in Steem Power and SBD. I haven't received any STEEM.

Today one of my post received a small of STEEM along with SP abd SBD.

Anyone has an explanation for this? Can it have anything to do with the current low price of STEEM?