What you don't see is the two different lines are on different scales. The amount of new STEEM production is higher than normal due to SBD being converted to STEEM. Since it is on a different scale, it doesn't look as big. The actual amount of STEEM being stored in SP is the highest I've ever seen.
Another way to put it.
If the blue line would have continued the linear direction, the orange line would have a dramatic drop. The reason that there is no dramatic drop is because there is a flood of new STEEM being created.