Well, I have a lighter but somewhat similar story. I deactivated my FB account a good 4-ish months ago. I went back to change my name (to indicate for folks where to find me) 2 weeks ago and I was greeted with a message that I cannot post or comment for 60 days because one of my posts (they showed which) is against community guidelines. I posted that a long time ago (8+ months) and it was fine until it apparently wasn't. The post was a single image, this one: https://imgur.com/a/BqgX28c