Note: I couldn't find another ticket pertaining to this.
I have noticed that when facing in certain directions, a player's legs seem to angle upwards. This can be observed best while swimming. This only seems to occur when the player -enters- the water from dry land, not if placed there beforehand.
It seems that facing Westwards causes them to go "up."
Pictures attached; screenshots taken at the apex of the left leg going up. {F19454} {F19455}