Hi Maddants,
My best advice to you at this time is to ask your wife to order your notes ASAP. You will need to both carefully identify any potential "red flags" that has raised concerns and has caused the VO to convoke an interview.
It may be surrounding your relationship or perhaps a security issue. Be prepared for everything and do not leave any stone unturned. Based on your submitted application, and their findings, they are concerned/not convinced for reasons unbeknownst to any of us. However, the notes can help you identify some of their concerns.
Wishing you the best of luck.