letter for sponsorship approval

[mamoo]

I have aplied for the sponsorship of my wife and two dependent children born out of my forst marrige there are 3 different sponsorship applications. All 3 aplication approved in June 2010 as per the letter erecived from CIC-M. Meanwhile I have received AOR from CIC-Islamabad of my dependent children showing case start date 23-7-10 however, I have not received my wife AOR but E-CASE showing case start date 3-08-10 in CIC-Islamabad. However two days back I have received a same approval letter from CIC-M which was previously issued by them in June 2010 but this time showing a date 1-12-10. I am confused why hey have sent me this letter . There might be the reason as I have shifted my residence address but that too in Aug-10. Can anybody give his opnion on this. The CIC-I still showing the same status in e-case with comments of IN-PROCESS.