When I notice something that doesn't look, or seem right on my car, I always compare it to others (obviously of the same model!).
If they are the same, then fair enough, I can accept it as being "normal". If they are different, then I have a case.
As your gap is the same as plenty of other people's, then I'd be inclined to say it was normal.
If it was leaking, that would be a different matter.
However, I can understand the niggling feeling inside when you think something is wrong.