I’m attempting to round one edge of a shelf in SketchUp. The shelf is 3/4" thick, so I’ve drawn a circle with a 3/8" radius, 3/8" in from the edge, and used the follow me tool to round off the edge. This worked fine on one shelf, but on the next, for some reason, the circle extends past the edges of the shelf vertically, but not horizontally. The tape measure says it’s 3/8" in every direction, the shelf is 3/4" thick, and the center of the circle is at the midpoint of the shelf. So why is it noticeably larger vertically than horizontally? I’ve tried adjusting the number of sides to the circle, but it doesn’t seem to help.

Is there any way to make SketchUp draw circles that are the same size in all directions?