Anyone know what might be happening here?

While cutting out these small inlay pieces I’m consistently losing a hundredth of an inch in width while cutting around the radius. Thought this might be due to chattering of the 1/8 in bit I’m cutting with but I’m experiencing the same results with a 1/4 bit. I did not experience this a few months ago last time I was cutting out these parts. Any suggestions or input would be greatly appreciated. Thanks!