I get these error messages. When going to my Watchlist and then filtering by Popularity (Lowest) I get multiple weird entries. My Watchlist is 3.600 items large. Did it get restricted recently? Can someone help please?! 
It’s a caching issue with some movies at Cloudflare. I am looking into a way to fix this and I think it also automatically fixes individual movies once their metadata is refreshed.
I’m glad you know enough to have an idea of what to do about it because that stuff is WAY outside of my wheelhouse.
Just the same, it doesn’t sound like it will be a major issue for me so thank you for setting my mind at ease. 
Just pushed a new fix for this. Within 8 hours it should start working. The fix tells Cloudflare to re-cache data on the movies with bad data.