I am trying to create a circular pattern of a wedge created by extruding a sketch to a plane (or Surface).  When I create the circular pattern, every instance of the wedge redefines itself by extending to the referenced plane above the instance in the circular pattern.  So I end up, not with a pattern of identical wedges, but rather a series of wedges which rise and lower based on the planar surface.  Can anyone help me understand why this occurs, and how I might be able to lock-down the defined wedge, so that every instance is not assessed on the angled plane at each location?  (see attached)

Thanks!