actually, negative stats happen because you did not put your stats when you reborn. Due to the nature of quad stats, you will have more than 32k stats point from level 1 to lvl 220. You need to put your stats before lvl 200. And monitor your stats point.
Server wise, stats point can be as much as let say 128k, but your client only able to show 32k number only. If your stat point become 40k, you will see, -24k stat point.