I was at the military base near north west airfield. I Climbed the military posts to keep an eye on the base. I waited for ages and decided to climb back down, clicking the down arrow and my character leaps to his death. He climbs ok but doesn't climb down just leaps out.

I've also seen this happen to my mate, his gun was in his hand and he clicks the down arrow. His character leaps out, then re-appears back in the hunters post/military post but with me I died.