When in F5 (third person) both front and back and your face is facing upwards or downwards if you go straight up/down then the camera perspective changes drastically.
When you are facing your face in third person, and want to look down then the head also looks up instead of looking upwards as it always has.
Your head can also bend weird from right to left without the body moving while looking straight down.

Everything can be seen in this video: https://youtu.be/GJL3P_Ye9u8?t=24 between 0:24 and 1:20