2 random blocks not working?

The purpose of this script is to raise and descend 2 random block in the jumparts model in a continuous loop until there is no more blocks in jumparts to raise, but what it does is raise the same blocks over and over again . I do not get any output errors and yes the debounce code works perfect. The blocks are random at the start but it just keeps raising and descending those 2 random block chosen at the start. Thanks for taking your time to read this post. I was to lazy to make a function for random numbers haha.

jumparts={}
for i,v in pairs(game.Workspace.jumparts:GetChildren())do
    table.insert(jumparts,i,v)
end
function ranNum()
local ranNum1=math.random(1,#jumparts)
local ranNum2=ranNum1


while ranNum1==ranNum2 do
    ranNum2=math.random(1,#jumparts)
    wait()
 end

 local blockChosen=jumparts[ranNum1]
 local blockChosen2=jumparts[ranNum2]


    if enabled==true then

        enabled=false

         script.Parent.BrickColor=BrickColor.new("Really red")





    for i,v in pairs(jumparts)do

      while true do   

        for i=4,13,0.3 do

        blockChosen.CFrame=CFrame.new(blockChosen.Position.x,blockChosen.Position.y+1.1,blockChosen.Position.z)
        blockChosen2.CFrame=CFrame.new(blockChosen2.Position.x,blockChosen2.Position.y+1.1,blockChosen2.Position.z)
            wait(0.1)

         end

        wait(1)

            for i=13,4,-0.3 do


            blockChosen.CFrame=CFrame.new(blockChosen.Position.x,blockChosen.Position.y-1.1,blockChosen.Position.z)
            blockChosen2.CFrame=CFrame.new(blockChosen2.Position.x,blockChosen2.Position.y-1.1,blockChosen2.Position.z)
            wait(0.1)

              end
              table.remove(jumparts,ranNum1)

            table.remove(jumparts,ranNum2)

                 local ranNum1=math.random(1,#jumparts)

                  local ranNum2=ranNum1

            while ranNum1==ranNum2 do

               ranNum2=math.random(1,#jumparts)

               wait()
             end
         end
       end
    end
     script.Parent.BrickColor=BrickColor.new("Lime green")
    enabled=true

end     
enabled=true



function onClicked()
     ranNum()
end 


script.Parent.ClickDetector.MouseClick:connect(onClicked)