离开场景后，生成的对象没有被移除。

嗨，我的物体在离开场景后没有被移除，我尝试过清理和移除场景，但是物体还是会在其他场景中不停地生成？

local badclout1 = {}
local bad1Group = display.newGroup()
local function spawnBC1()
   local badclouts1 = display.newImage("BCloud1.png")
   badclouts1.x = math.random(0, _W)
   physics.addBody( badclouts1, "dynamic", { density=.1, bounce=.1, friction=.2, radius=45 } )
   badclouts1.name = "BCloud1"
   badclouts1.bodyType = "kinematic"
   badclouts1.isSensor = true
   badclouts1.y = math.random(-100, -50)
   badclouts1.index = #badclout1 + 1
   bad1Group:insert(badclouts1)
   badclouts1.rotation = math.random(-10,10) -- 旋转物体
   badclouts1:setLinearVelocity(0, math.random(speeda1, speedb1)) -- 向下掉落
   badclout1[badclouts1.index] = badclouts1
   tmrSpawn1 = timer.performWithDelay(math.random(spawna, spawnb), spawnBC1)
return badclouts1
end
tmrSpawn1 = timer.performWithDelay(math.random(1000, 10000), spawnBC1)
 local function removeBomb()
  for i, v in pairs(badclout1) do
    if badclout1[i].y >1000 then
        badclout1[i]:removeSelf()
        badclout1[i] = nil
     end
  end
end
Runtime:addEventListener("enterFrame", removeBomb)

我的代码里有什么导致物体一直停留在屏幕上？