I can't select a vertex to extrude up to!

Hi everyone,

When I try to edit an "up to vertex" extrude by changing the vertex, the extrude just mirrors itself in the opposite direction. I have attached a file including two extrudes that use the exact same parameters but they are in the opposite directions. This problem happens when I edit an existing extrude and not when creating a new one.

Many thanks in advance

SolidworksParts And Features