Michael Gibney

Whilst chasing a minor oil leak I removed one of the exhausts and of course I looked up into the 3 exhaust ports, the front cylinder looked fine, nice neat valve seat lining up all the way round with the aluminium port casting. But on the rear two being cylinder No 1 and the middle one, the valve seat is about 1/8th of an inch off to the side of the port, The first photo is the good seat, the other two photos are the misaligned seats, is this normal?