Heather I switched off something on my host last week to do with caching but if anything this should have improved EZoic caching.
I am fairly sure caching is still working behind the scenes as I made a change to my theme roday and cleared the Ezoic cache just for that page in order to see it.
So I suspect it’s just a graph issue particularly as another user has just reported same issue. My % caching is still increasing over past two days.