When I was climbing on ladder and want to get off in halfway, it's very dangerous, body "jump" up and down. (distance between up and down +- heigh of boots) You can use "wsad" keys and "ctrl" to safe walking there, but I don't know if there is an option to fall down when that body "jump". One time I was climbing on ladder and get off in halfway, I used "a" key lightly and my survivor just fly +-10m away from radio tower to the ground, maybe because i don't use "ctrl".

For sure that "jumping" need to be repair.