It’s almost certainly a dirty or scratchy knob that’s ‘bouncing’ between values and causing the pop up screen to persist. Probably worth a trip to your local tech to get done properly.

Sounds like those two parameters you use are things you use a lot. If repair proves difficult, it might be time to record your show and write permanently the desired reverb and filter settings to the registration, and perhaps see if the filter parameter could be changed to an expression pedal which is likely to be more robust and not displayed when used…