My seatbelt has become twisted in such a way that I cannot work out how to untwist it. Given that both ends of the belt are fixed, how is that I cannot untwist it? No matter what I do I end with up either it twisted across my lap, or against my chest. Looks like I will have to detach it from next to the seat (presuming I have the tools to do so) or just live with it? But how can this have happened?!