If you click the Filter control button to change "favorite" filters as shown in the image to the left, but the filter selected in the Filter Scale remains in position, then it is possible that both of your favorite filters have been programmed to the same frequency. In other words, you are changing between your first and second favorites, but because both favorites are set the the same position on the Filter Scale, it appears as though the favorites do not change when, in fact, they do. For information on setting favorite filters, click here.