Pawn with skeletal mesh falls despite 'Enable Gravity' not ticked

I have a pawn blueprint with a skeletal mesh, and I’m trying to do some physics stuff with it. Not only will it move in odd directions (force applied in positive x = drifting down and to the right) when calling AddForce, but it falls, as the title says, when ‘Simulate Physics’ is ticked, but ‘Enable Gravity’ is not.

Why would it still be falling straight down?