It's the ejector and it's supposed to be bent on the 9mm models. Different calibers require the ejector to be in a certain spot, so you will see varying degrees of bend across calibers.
The 40 case is wider, and so the ejector is farther out. The 9mm is narrower, so the ejector must be closer to the center of the pistol. Yours are in the correct spots. No need for concern.
"Breathe when you can, shoot when you should."
"Qui desiderat pacem, bellum praeparat; nemo provocare ne offendere audet quem intelliget superiorem esse pugnaturem"