US Immigration from Armenia

Hello All, for couple of days i have been going crazy trying to figure out how to get this paper work together after Notice of Rejection.

My question is For k1 and k2 AOS can i use one set of i 864 affidavit for both petitions or 1 for k1 and 1 for k2? Did anyone notice the change in EAD form? the dates are seems to be confusing.

Thanks and Lets All Stay Safe.

I recently mailed out AOS for my Wife and Daughter after marriage to K1. 2weeks down i just received the whole package with a rejection notice. "Stating i filed the wrong I-485."I did download the most recent I-485 07/31/2021 from the uscis website a week before mailing it out but it turns out they rolled in an updated version which expires 10/31/2021 same week i when i mailed it out. Long story i got my whole package back which really hurts...

1) My question is has anyone been through this before?

2) Did get the most updated form and mail back the same copies? or printout all new copies? Reason being they have a green form on the package asking me to place it on the package when am resubmitting the the package. And on the bottom of the page they have codes running on the bottom?

3) Also i signed my daughter's i485 as the preparer. i dont know if thats another error right there.

I will be glad to get any information to help us through this process.

Wishing everyone the Best.