Bug for no reason?

function updateNPC()
  if npcmode == "dumb" then
    turn = math.random(1,4)
if (turn == 1) and ((map[npcpos-9] == "-") or (map[npcpos-9] == "d" and door)) then
   npcpos = npcpos-9
   npcy = npcy-1
elseif (turn == 2) and ((map[npcpos+9] == "-") or (map[npcpos+9] == "d" and door)) then
   npcpos = npcpos+9
   npcy = npcy+1
elseif (turn == 3) and ((map[npcpos-1] == "-") or (map[npcpos-1] == "d" and door)) then
   npcpos = npcpos-1
   npcx = npcx-1
elseif (turn == 4) and ((map[npcpos+1] == "-") or (map[npcpos+1] == "d" and door)) then
   npcpos = npcpos+1
   npcx = npcx+1
end
  elseif npcmode == "stalk" then
    if npcy > chary then
   if map[npcpos-9] == "-" or (map[npcpos-9] == "d" and door) then
	 npcpos = npcpos-9
  npcy = npcy-1
   elseif map[npcpos+1] == "-" or (map[npcpos+1] == "d" and door) then
	 npcpos = npcpos+1
  npcx = npcx+1
   elseif map[npcpos-1] == "-" or (map[npcpos-1] == "d" and door) then
	 npcpos = npcpos-1
  npcx = npcx-1
   end
elseif npcy < chary then
   if map[npcpos+9] == "-" or (map[npcpos+9] == "d" and door) then
	 npcpos = npcpos+9
  npcy = npcy+1
   elseif map[npcpos+1] == "-" or (map[npcpo+1] == "d" and door) then
	 npcpos = npcpos+1
  npcx = npcx+1
   elseif map[npcpos-1] == "-" or (map[npcpos-1] == "d" and door) then
	 npcpos = npcpos-1
  npcx = npcx-1
   end
elseif npcx > charx then
   if map[npcpos-1] == "-" or (map[npcpos-1] == "d" and door) then
	 npcpos = npcpos-1
  npcx = npcx-1
   elseif map[npcpos-9] == "-" or (map[npcpos-9] == "d" and door) then
	 npcpos = npcpos-9
  npcy = npcy-1
   elseif map[npcpos+9] == "-" or (map[npcpos+9] == "d" and door) then
	 npcpos = npcpos+9
  npcy = npcy+1
   end
elseif npcx < charx then
   if map[npcpos+1] == "-" or (map[npcpos+1] == "d" and door) then
	 npcpos = npcpos+1
  npcx = npcx+1
   elseif map[npcpos-9] == "-" or (map[npcpos-9] == "d" and door) then
	 npcpos = npcpos-9
  npcy = npcy-1
   elseif map[npcpos+9] == "-" or (map[npcpos+9] == "d" and door) then
	 npcpos = npcpos-9
  npcy = npcy+1
   end
end
  end
end