There looks to be some insider buying with SV, hence some exchanges trade SV higher than others.
Also FOMO is kicking in, with people saying SV's price will get multiple times higher than BTC ATH.
Whereas the reason why some exchanges trade SV lower (such as Poloniex and Bittrex) is because deposits haven't been activated yet so no arbitrage is possible. Things might change end of this week..
When FOMO end and i guess that will be back again. I have seen this situation so many times and remember when these guys roger jihan and craight were FOMOing bitcoin cash as the next original bitcoin and at the end of the story it's died. this is a big joke in this day.