Is the website machine generated? Besides the hard-dependency on JavaScript, this also causes the exact same problem I've seen on another[1] machine generated site: https://postimg.cc/TyMBfVZ6, https://postimg.cc/n9j1X5Dk. This happens randomly on refresh on Firefox 148.0-1.

Is the fade effect really worth having parts of your site disappear at random?

[1] https://news.ycombinator.com/item?id=46675669