When I try to program in the final freq on the list, 859.9675, it changes to 859.9687 in my HomePatrol scanner. If I try to then re-enter 859.9675 I get an error that says the frequency already exists. If I delete .9687, I can re-enter .9675 but it is again displayed as .9687 ??? Is this proper behavior or does my scanner have Mad Cow disease?