I tried to explain that above, but I'll do succinctly here :)

SBD is insured against Steem. So if there's too much SBD in the market, there's a system that diverts some of the rewards you'd normally get in SBD to Liquid Steem. That both increases the amount of Steem and reduces the amount of SBD, and thus reduces the Steem-SBD debt ratio.

This is what's going on here. A portion of the SBD reward instead gets translated to "equal value" (but actually less, for that, read the in-depth explanation above) amount of Liquid Steem.

The preview is just not designed to show you these figures, alas. It's actually all translated VESTS, the actual denomination of all the rewards, shown nowhere...