Video conversion in progress ?

Does anyone know why I keep getting "Video conversion in progress" on some of my saved URLs. It's been happening for a few days. Here are a few examples...

https://xhamster.com/videos/self-pee-cute-girl-pisses-in-her-mouth-7550477
https://xhamster.com/videos/hot-teen-shower-pee-8961415
https://xhamster.com/videos/teen-pissing-in-her-own-mouth-7074869

Just curious :)