It doesn't seem like it was enough evidence and USCIS issued RFE because of this.
Bonafide marriage evidence
Did you send any evidence of living together? Joint lease and copies of utility bills in both names?
Did you send evidence of comingling finances? Any joint banking account statements? Tax return transcripts showing you filed taxes jointly?
Any insurance policies (health, life, car) showing both names?
Any proof of travelling together or any big purchases as a married couple?
Any affidavits from friends, family, colleagues, building managers saying they knew you as a married couple?
Abuse evidence
Any police reports that were filed documenting abuse?
Any medical documented proof of physical abuse?
Any phychological evaluation showing damage abuser caused you?
Any records of you staying at shelter to be away from abuser?
Any affidavits from friends, family or witnesses of abuse?