Active Silver has been reduced!

Dear expects!

On Oct-12-2011, I got exactly 500 points, & I had become active contributor silver.

Please see in link below:

http://www.sdn.sap.com/irj/sdn/mypoints?userid=xpr318QnRl4%3D

But after being busy with my private maters, I came back & now I just Active Contributor Bronze.

I don't understand why. Could you please help me to explain it for me? I've read policy of sdn but I could not map with this case.

Thanks so much for your supports!

Best regards!

Woody.