Sort:  

It can happen because more smartcoin have been 'settled' than issued/shorted W/W.

Settlement is when BTS collateral backing the smartcoin is released, after which the smart contract destroys the smartcoins which results in a lower supply.

Coin Marketplace

STEEM 0.14
TRX 0.23
JST 0.031
BTC 87150.84
ETH 2005.77
USDT 1.00
SBD 0.80