It sounds like it is behaving as it should. You would appear to have the unit configured so that the pedal drives feedback on voice B (FB-B). Depending on the effect, this is usually the bottom right knob, "yknob" or knob 7. Turn this knob and you should get the same display. If you look under setup/MIDI/RCV CTL you should be able to confirm this hypothesis (read manual if necessary).
You may need to adjust the knob on the pedal to get the best control range.