What is strange is the liquidity (Depth). Beside holidays and news events there used to be at least 1000 orders standing at each price on the ES. However these days it's a mere 500 orders standing at each price ...
Depth and volatility are correlated most of the time.
As volatility increases depth tends to go down and vice versa.
Roughly if the ES range is average 40pts per day, i would expect approx half the depth as when the range is 20pts per day (all other things being equal).
This is because limit orders are spread out more as prices are expected to reach wider extremes on every move that occurs.
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