Hi Carbon, now let me get this straight right off the bat. You didn't here this from me!!! But what you can do (provided you don't have any little ones running around), is take the two sensors and place them face to face above the door, tape them together, and this will eliminate them from the equation. It sounds like one of the sensors got bumped and is out of alignment, so placing them point blank face to face makes 100% sure that they are in line with each other.
Now if you do have little ones running around, do this only for a short test. Then if it corrects the problem, do the actual work to align the sensors in their appropriate settings.