[Zechnophobe]

    
 iskrit = ( kritProbRnd < kritProb )
      if iskrit then
        if receiver_human and not receiver_glot then
          kritProb = kritProb - skill_power("weakness_lore", 2)
          if kritProbRnd < kritProb then
            iskrit = true
          else
            iskrit = false
            is_weakness_lore = true
          end
        end
      end

Logic was just all topsy turvy. They intend to check IF IT IS STILL A CRIT, but instead of letting it be a crit, they instead cancel it. I believe the above should fix it unless I'm misremembering lua 'else' syntax.