It's fairly "normal" but I wouldn't let it continue. Get some hi temp RTV sealant at the auto store and put it on the pipe flange and fill the gaps around the pipe where it falls into the flange on the top end.
I know. You're still fine. That's just excess oil seeping out of the area around the pipe and head. It's the same oil that exits the silencer just it doesn't make it that far.