Demoted from floors?

I was just on floor four not to long and now I'm back on floor three,why?

[support9]

Hi KSIMN7,

If your Weekly PVP Score is much lower than average, you will be demoted from Floor 4 to Floor 3. According to your description, you must have been downgraded. Please refer to the Lost Tower climbing tutorial for details: http://www.haypiinc.com/monster2iphone/climben.htm
Good luck and keep it up. Hope you can climb up soon.