any thoughts on why I would have oil in there

i recently had an oil leak after changing my intake( the one i had machined to fit) i thought it was valve cover gasket so i changed them. seemed like i still had the leak so I pulled the valve cover and checked the intake bolts and plus the seal each end of the intake and the line for the pressure gauge. well found oil puddled in the half moon hole/area( not sure what to call it) in the center of the head. I have seen numerous threads about folks dropping stuff in there and the census is dont worry it dont go anywhere. so im puzzled on how any oil is in there

so maybe the valve cover leaked and filled that area and i just need to get the oil out ?? i have been rolling up paper towel and stuff it down in there to soak up the oil and there seems to be a lot of it in there.

or could it be something with the gaskets/s(its only on one side)

thanks in advance don