First, I point the mouse at the elevated tile next to the enemy. Note that the attacker's odds are 56% and there are 2 attacker POA's:
Next, I move the mouse one hex to the upper left, so the mouse pointer is on the Welsh Spearmen. Now we only have 1 attacker POA, which is correct (so far) because the path we're taking no longer leads to a higher elevation:
Lastly, move the mouse back down to the hex we were originally on. Note that even though the path the cavalry is taking is exactly the same, it no longer shows the higher elevation POA, and we only get 1 POA.
