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All else equal, 2-edge should be worse than 1-edge. It's the number of edges that the TV signal diffracts over to reach you. But 36 is predicted to be somewhat stronger than 40, in spite of that.
The plot is a simulation, and does not account for local obstructions such as trees and other buildings. And digital TV is all-or-none - either the signal is strong enough for the receiver to lock on to, and you get a perfect picture, or it's not, and you get nothing. If it comes and goes, you are right on the cusp of enough signal, and local conditions (ie trees swaying) are changing the reception.
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