I know this was 7 months ago but this is really weird
All these things happened to me too but only when S and Hunter crossed paths (since they can't just phase through each other): if they cross paths before S goes between terminal 2/5 and the room/fax, S decides to check terminal 2/5 instead to clear the path for Hunter, and if they cross paths while S is already halfway through the corridor, he decides to enter the room (or the fax), again, to clear the path for Hunter. If they cross paths while S is almost done crossing the corridor, then S might decide to just cross the entire corridor backwards and then check terminal 2/5 for some reason, or Hunter might decide to wait for S to finish crossing (probably depends on the exact frame they cross paths??? idk)
However in your screenshots it doesn't seem like S and Hunter are crossing paths at all so that's weird