Oftentimes with commemorative coins there are flaws in the design, or odd things end up just being a part of the design. Have you compared this to other coins like it?
i have 2 of these. one gold plated and one silver plated. both are the same. plus I have one different one with letter issue too. I see what you mean about common. 3 coins...all with issues the 3rd pic is my other coin