This issue is from arma II. Everytime you climb a ladder, you'll notice that, the sound stay at the exact point you started to climb.

The problem is, if i am on the top of the hospital for example. Someone can easily climb the ladder on the back of the building, i won't hear him. Because the sound will stay on the floor. And same problem if i go down. The sound will stay on the top of the ladder.

This happens everytime.