RE:I really
According to Wall Street On Parade, a while back,
https://wallstreetonparade.com/2022/01/the-new-york-fed-has-quietly-staffed-up-a-second-trading-floor-near-the-sp-500-futures-market-in-chicago/
As far as I can quess, there might be some background modulation going on (broadly speaking & in general).