There is supposed to be a cover over the engine
with the cover in place it is easy for wind to blow oil away from the filler hole when topping up. I think this is what you are seeing.
Confirmed, when topping up or changing oil it's easy to spill some oil on the edge which ends up on the cam cover. Be sure to remove the two left coils and give it a good clean up while you're at it, also inside the spark plug holes.
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