from what I've gathered it's because of a lot of things but VRC places it automatically. they're working on it though. It should be based on eye height I think but instead it's trying to place it based on like the tops of your ears and hair. THing's that could trigger it from what I've read: If you calibrate your playspace wrong in OVR, if you have a parent constraint (non-specific about how or what type) and if you have something tall on your head (what I believe might also be an issue, even if it's completely see-through)