I suspect someone switched blades at the store. I bought ink for my printer at Walmart one time. Got it home, opened it at the top and saw the cartridges didn't have plastic around them. I checked the box over and found someone had slit the bottom open, removed good ink, put in old cartridges and then glued it back shut!!!!!!! So now when I buy ink there, I open the package before I leave. Did I tell you about the opened Kotex box??????????? Yip, someone was desperate!!!! SOOOO -- it sounds like you got some bad blades.......take them back if you still have the package and get some new ones.