No sound on jump landings

So I noticed I heard a guy get on top a conex box and it didn't sound any different considering he was on a hollow metal object but then he ran which I only heard 2 steps for a 10 ft range then he jumped off the conex box high in the air and landed without a sound at all so how does that work footsteps make noise sometimes nowadays only when I'm looking at them but jumping 15 ft in the air and landing silently doesn't make any sense to me I think it should be considered as a big to be fixed