Waxing

I have short hair and it is dark.  At least once a week I wax the facial areas and trim the sideburns.  The last two weeks I have had a problem with the razor not cutting close enough so I have been using his beard trimmer.  A little frustrated with this yesterday made me look a little closer.  This was a brand new razor I had gotten out of the package.  Why won't it shave.  Upon looking and feeling a little closer, I finally found the problem.  Would you believe the head of the razor was on upside down.  After putting it back together the right way it worked much better.  I will check the rest of the package for the same problem......