Typical interior beams with a uniform floor where the tributary width does not vary will produce similar results regardless of which sampling density has been set in the Preferences menu. Whether the beam is sampled at one point or many points, the sampling will return matching trib conditions at all points, resulting in a uniform linear load in the ENERCALC SEL interface.
In this case, ENERCALC for Revit detects two adjacent beams and reports a tributary width of 7’-0”, along with the area loads found on the floor. Since the floor geometry and loading are fully uniform and identical on both sides of the beam, the loads from the two sides of the beam are NOT reported individually.