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3504 Display Position Error

We use a 3504 to control a motorised air valve on a gas fired oven. I recently replaced a valve & on the 3504 changed the minimum on time from auto to 1 second (required for the valve) and travel time from 22 to 16 seconds. Both valves use a pot for valve position display. Control type is vpu.

My problem is not the operation of the valve as that controls to setpoint fine but the position display. When switched from auto to manual the valve position shown is very different to the pot position. I understood from the user manual the travel time was the main influence on position display, are there other factors i need to consider?
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