I encountered a bug on discussion.fedoraproject.org, where I was editing a post that I created. I wanted to add something in the middle of the post, but every time I typed a letter, the preview would scroll one line to the bottom. This made it difficult to see what I was writing, as the preview showed something below that.
I have attached a screen recording of the problem here Screencast_20230925_151230. I am using Firefox 117 on Windows 10.
EDIT: I tried it and it seems to be only happening in the fedora instance