Apparently Falco has three meteors: Dair, Falco Phantasm, and Utilt. If the data is right, there's part of Utilt that meteors and only does 3% rather than the regular 4% that leads to the second hit doing 5%. That's so weird. I think it has to do with the animation of his arms spinning. Both arms arc from down to up, but because or natural movement, his right arm, the arm that hits first, ends up down while his left arm begins to hit. There's probably a lingering hitbox that was never removed for some reason. It's probably useless as a meteor because it has so little range, but it's still a weird little thing about the game's programming.
Edit: Technically, it could be a regular hit that sends people down. Not entirely a meteor, but not a "normal" hit either. On that one frame, it has a hit angle of 270 which is straight down.