The axle was not on the pins when the ubolts were torqued down. The pins dont "hold" the axle in place. They simply align it during assembly. Make sure when you install this one, the pins are in the holes before you tighten the bolts.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.