Mine is the same. And I have fired mine with no problem.
It does not help to get the cylinder lined up different, even with perfect alignment my hammer will not go into the notch.
I do not know if it is supposed to.
I do know that this is a common enough situation that just yesterday I read about someone, or saw something somewhere on the internet about someone who had filed theirs down to get it to work.
Mine is consistently like that all around the cylinder.
Mine is a just new from Cabelas Pietta 1858 Reminton. I believe that is what I read about yesterday.
So I don't know how or why this happens, just that it does appear to be common on 1858s.