Based on this pic, I don't see doubling.
Just a few tips so we can help better: make sure the lighting on your coin is equally divided. No dark spots or spots with too much light. I know it's hard as metal tends to reflect all the light. Please try to find either a very neutral (non-reflective white) background or crop out all the background. That really helps in focusing just on the coin without having the brain distracted by anything else... Good luck!