485 副申请人批了, 主申请人还没有批, Another question to ask Pjiang

Thanks for help, Pjiang, Here is my situation:

We filed 485 for three times:

1) 1st 485s (including me and my wife) based on my wife's EB3 140 on july 2007;

2) 2nd 485s (including me and my wife) based on my wife's EB3 140 on August 2007 (because we did not receive the receipt for july 07 filing, and we withdrew 2nd on Nov 07 after we received receipt for the 1st 485 filing)

3) 3rd 485s (including me, my wife adn daughter) based on my EB2 140 on april 2012. the RFEs are for 3rd  485s.

Now, USCIS approved my daughter 485 filed in 3rd 485 April 2012 (including me, my wife and daughter) based on my EB2 I-140 and approved me and my wife's 2nd 485 (including me, my wife) filed on Aujust 2007 based on my wife's EB3 I-140 (i.e., we already asked them to withdraw).

In my situation, does USCIS made some mistakes OR this is normal?

 

Thanks for any kind help?