US Immigration from Philippines

my 2 brothers petitioned by my mother back in 2011 under unmarried child over 21 of LPR , both got approved 2012 and last year both of them got NVC case number and password to login. We did everything (fees, ds260,aos,civil documents) NVC only responsed to one of my brother "accepted, rejected, and missing some document" but nvc did not response to other one. Everything say completed and submitted January 2021..ONLY MESSAGE WE RECIEVED (NVC cannot review your submitted documents until we have received all of the required documents DS-260, Civil Documents and Financial Documents. Once these documents have been submitted, we will review your case. Please follow your CEAC Home page and https://nvc.state.gov.) I DONT KNOW if we missing some documents, or are we doing it wrong.?

Question:

Fee for I-751, Biometrics were done two years ago, do they need to be done again? Thus, do we pay a second fee, with the I-751 for another Biometrics?

https://www.uscis.gov/feecalculator, No Children

Calculator results:
Your Fees
Biometrics $85.00
I-751 $595.00
Total $680.00

Starting a topic to see how long it took to get an update on y'all cases. Thanks a bunch!

We moved from CA to WA last November and I have yet to apply for a WA license due to covid. We're also only going to be here for 12-14 months and then going back to CA so I'm on the fence about switching everything over and then having to go back to the DMV in CA to do it all over again. Would it be a problem if I presented an out of state DL during the interview and just provide our lease, utility bills and the USPS change of address confirmation?

I've notice most receipt numbers seem to start with MSC but ours both (I-485 and I-130) start with IOE. The I-130 was done online in September while the I-485 was sent by mail in December but has the same priority date in September as the I-130. Does anyone have a clue to what the different numbers (letters) mean?