Carb issue?
With what you have for typical hyd lifter leak down rates these days, I wouldn’t consider a cranking compression test as the last word on how the engine sees the timing events while it’s running, and the lifters are fully pumped up.
You could verify the accuracy of the test by adjusting one pair of rockers so the lifter preload was just up from “bottomed”....... to see if it impacted the results.