Sorry, I’ll try and explain it a little better. When the oil return holes on the heads get clogged with carbon slug produced by combustion it can slow and sometimes stop the flow of oil back to the oil pan. If your seeing seepage around the PCV valve there’s a good chance the valve cover is filling with oil because the oil return holes are restricted with slug. I had this issue with my old 91 Montero about 3 years ago. I ran some pipe cleaners down the return holes and it seemed to take care of the problem.
That would also explain why your oil level is off. There is still a lot of oil up in the valve covers. I try and find some examples of this.