I get strange notifications in game as well about my town being "overrun" after I've just cleared nightmares. It's confusing for me too, but I pretty much ignore it. The first few times it happened I spent a good 10 minutes searching for these phantom nightmares!
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Did you log-in to her SF on your device? If so, have you tried hard-closing the app, clearing cache, & restarting device?
I have to say I enjoy the forum more at night, less people around to start trouble, even when someone throws out obvious bait. Some people may think the only good GD thread is one that is full of obnoxious, brash and outlandish comments, but I enjoy talking about the game. All that other junk is distracting and definitely not fun.
But nice try though.
I think after you clear your town, it releases what was in your bank (stored nightmares) and your town becomes flooded with nightmares.