I have a SC-901 stereo in my XC and when I am trying to tune to the local CBC AM station at 860 the stereo tunes to 864 instead.  This means the signal is not as strong as it would be if on the correct 860.

Why would the stereo not tune to 860?  When using the manual dial it just jumps over 860 to 864 and when I do a search, it does the same thing .