That sounds similar to what happened to my sister-in-law. She had been divorced and out of the truth for years. All of the sudden one day the elders from the neighborhood she had moved to showed up at her doorstep wanting to setup a meeting. She was, and had been, living with someone. Her ex was the son of the PO where she used to live and even though her ex had been disfellowshipped quite some time ago for sleeping with someone else he spouted off to his dad one day something to the effect, "you won't talk to me and I got df'd so why isn't my ex who is living with someone df'd? How is that fair!" So what did daddy PO do? He contacted the local elders and told them she was living with someone and it was "stumbling" his son. What a load of crap! They held a meeting without her and df'd her. It's so ludicrous.
Granted... Don't quote me on this exactly but that's pretty much how it unfolded.