ANSWER:

It is actually very common for the middle leg of a 3 legged formaiton (i.e., wave-b in a zigzag or flat) or 7 legged formation (i.e., wave-d of a NEoWave Diametric) to be the shortest in price.

On the other hand, the middle leg of 5 and 9 legged corrections (wave-c in Triangles and wave-e in NEoWave Symmetricals, respectively) should NEVER be the shortest in price.