DISSAPEARING NETHERITE

EVERY TIME IN MY ANTI-CHEAT WORLD WHEN I GET NETHERITE,IN 2 DAYS THE ITME DISSAPEARS! GIVE ME BACK MY NETHERITE PICKAXES (2) MY SWORD OF NETHERIT AND MY BLAST PROTECTION 2 NETHERITE LEGGINGS AND PROTECTION 1 CHESTPLATE!THEN FIX THE BUG!!!!!!!!!!!!Unable to render embedded object: File (OR IM CALLING THE COPS) not found.!!!!!