Can you to into MixEmergency's Preferences, to the Transition panel, and see at what point the setting for "Trigger Auto-fade with Crossfader at:" setting is set to? Also, check that the Contour settings are disabled. If none of this helps, it might also help to open Serato Video and check that crossfader contouring is disabled there as well - as I think this can have an effect on the values sent through to MixEmergency.