Fedora Discourse scrolling is erratic

I have noticed since i came here that the Fedora Discourse forums tend to be choppy / jumpy when scrolling through threads. I have a feeling that it might be caused by a specific local implementation since it doesn’t occur on other Discourse forums (e.g. Gnome Discourse).

What happens is that when scrolling down a thread, every few reactions or so the screen tends to jerk back up a bit. This can make it difficult to scroll to the end, since sometimes the same reaction keeps jumping into view for a while.

I have recorded a short screencast that shows the behaviour.

There might be a plugin or script installed here that tries to do something during scrolling. Any idea what could be the cause?

I’ve only tested with Firefox based browsers.

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I think I am seeing the same thing in safari on the ipad.
I scroll down and the list jump back up.