First off- ask the weapon checker why they failed it-- they will tell you. Who knows the might have a valid reason, they are weapon checkers and all.
secondly dont jump to the conclusion that they're retaliating towards you, Cedric is a close friend of mine- and he's called me dead in a tourney when it has been a bad call. He generally doesn't pick on people just cause he doesn't like them... and just cause he's a jackass doesn't mean he dislikes you.