Hi Guys,
after having a few of my team mates killed and myself I have found when in some buildings with the Mountain backpack on, it causes you to be sucked through walls.
This only happens if your backpack clips through the wall so either backing into a wall or suddenly turning around when looking out a window can throw you from the building.
Unable to reproduce all the time so I might not have accurately found what is causing this.
Thanks for your time