Welcome again to everybody! Make yourself at home. In the time-honoured tradition of our sect, here is the weekly discussion thread.
● Matrix homeserver and space
● Theory discussion group on Matrix
● Find theory on ProleWiki, marxists.org, Anna's Archive and libgen.
● Audio versions by Socialism For All (just keep in mind that he's an ultraleftist)
A similar thing has happened with me. It's usually when there's a picture. When I scroll down the picture shrinks, takes up less space and the page slides upwards to fill in the space.
Does it happen more with threads where you've opened some screenshots, etc?
The screenshots don’t make any difference. I tested this out on the create post page without inserting any images or URLs in it and I still got the glitch.