I have found that, with the proper fill, if I check oil level 15 minutes after hot shutdown, the level will show right at the full mark on the dipstick. However, if I check it prior to startup after an overnight or longer sit, the level will show exactly as you described.
The wife drove the truck today about 25 miles round trip. I went out and checked the oil level about 20 minutes after she shut it off and the oil level was still showing overfull. I think I'll drain it down to dead on the top of the hash marks like it should be so I don't have to make another trip to the dealer thats a pain. I guess it's not the end of the world but I've put about 200 miles on it since I had it serviced, wish I had made sure it was dead on before I drove it all.