Oil overfilled, wasn't before

[Sylvanite]

I checked the oil level recently and to my surprise the oil was half an inch above full mark on the dipstick. It's been parked a lot, it drove about a mile last week, drove a few times before that since the oil change in late May, maybe ~90 miles total. Now, it has a lot of oil leaks, so I was expecting the level to be low if anything. Oil seems clean, no antifreeze I think. Any ideas as to why this happened?