I just got an injector from someone on the BST. I went to CVS and picked up some injector blades, inserted the key into the razor, and pushed the handle forward. The little piece of metal thats supposed to push the blade forward just went over the blade, pushed it a little forward and went to the end while the blade was still in the holder. I then pushed it back to try again but now it just skips over that first blade back and forth. Is this something defective about this specific blade pack or am I missing something?