I have a Yasnac MX3 controller on a Kitamura Mycenter

I have a problem with it cutting too short of a path when using cutter comp G41 or G42 during a radius. I included the program which I am pretty sure is not an issue. I am just rounding the end of a 1" wide 1/2 thick piece if steel. Here is what happens. It is programed for a .520 radius with a compensation offset on D15 of .310, which should in fact create an actual machine position movement of 1.660 (.830 radius) along the Y axis, the machine moves a grand total of 1.5692. I did this cutting air so tool pressure is a non issue. I set the cutter comp on offset D15 to .000 and the thing moved 1.040 on Y (.520 radius) like it should. I also tried changing the cutter comp value from .310 to .320 expecting an extra .020 on the Y axis during the radius and I got an extra .0171. The X axis appears to behave
itself. I have had this machine for 3 months and still debugging it. Is there a parameter that may be wrong? Thanks in advance for any suggestions.

G91G28Z0
G20
G17G40G80G90
G53G0X-3.Y-3.
T5
M6
(1/2 EM)
G54G90G0X1.2Y-1.2S3000M03
G44
G41G17D15
G00X1.2Y-1.2
G1X.52Y-.52F20.0
G0Z1.0H5
Z.5M08
G1Z.1F50.0
G1Z-.6F20.0
G2X.52Y.52R.520F2.0
G1Z.1F20.0
G0Z1.0
G0Z2.0
G49
G40D0
M5
G91G28Z0
G53G0X-8.0Y-3.
M30