That sounds about right, because you are rotating around the workpiece, it's just that your turntable-coordinate system is rotating in the opposite direction, so that the robot isn't moving that much.
My guess is that your turntable is not configured as a synchronous axis, or that you didn't calibrate your base as an Offset Base (Startup, calibrate, External kinematic system, Offset). If you calibrate it as a normal base, it won't rotate.
When using a turntable, KUKA|prc automatically assumes that you're using an offset base.
You can check if you're using an offset base by looking at the XYZABC values of the base. By default the origin is the origin of the robot, but with an offset base it's linked to the turntable. So in your case it will be rather low values.