You have to edit format.
To be sure the feed is 0.5 - just output literal feed value in motions and you can see that feed is 0.5....
But in block/address output it is F1.
So definitely it is by format setting.
ALso (same dialog) make sure the "min" value for each appropriate feedrate type (xPM, xPR, DPM, etc.) is "small enough" (for IPR I would set the min to .0001 or similar)
Production: NX10.0.3.5 MP16/TC11.2
I'd rather be e-steamed than e-diseaseled