$Proshares做空標普500 (SH.US)$  Can any guru explain why short e...

$Proshares做空標普500 (SH.US)$ Can any guru explain why short etf still paying dividend? I don't quite understand, normal etf do pay dividend, this make sense because underlying stock do pay dividend, I don't understand short etf like this SH.US where is the dividend come from? since the etf short the underlying stock, it shouldn't have dividend payout right?