Expression pedal behaviour

Not sure what the standard behaviour is but just checking as it does appear to have changed. I have an exp pedal plugged in to port 4 set up to send a MIDO CC message. When I change to a Preset on the Helix HX Stomp via a button press on the MC8 the pedal position seems to be read, although no MIDI message is actually sent unti I change the pedal position. Previously the value in the HX Stomp used to stay at the default UNTIL the pedal moved. Now it looks at pedal position and makes a change which is undesirable, only want it to move when I waggle the pedal . . . ?