I think that
Zom0898 was talking about the orientation of the activation button and not about its shape. The original have a slight taper toward the exterior end, while yours is straight. Most likely you inserted those the other way (with the tapered part inside):
Thanks for pointing that out. Everything was already attached when we received the jet pack. Well now this is going to bug me...I wonder if that detail will have any impact of him getting approved?