Pjiang,Xiaobaitu,Radiology and other experts,what happened on my

My I-140/I-485 was concurrently filed in Sep.2005 and I-140 was approved in July 2006. The name check was finalized on Sep.12,2007. I just check my case status online and found my I-140 was updated on Sep.30,2007 without message change.Interestingly, no updates were shown in all the I-485 status of my family. What's the matter? Why USCIS touch my I-140 after NC finalized? I am afraid something is wrong. Please help! Thank you all!