I almost went ahead and created a github issue for this but, maybe it is being too picky and not worth creating an issue when there's more important things to work on?
I haven't tested different browsers but in Chrome, the first time you scroll the page, the top nav bar does a very slight jump. After the initial scroll it doesn't do it again. You have to do a full page refresh to get it to do it again. It's not just my forum, it happens here at discuss.flarum.org too.
Any devs know what I'm talking about? Is it known? Should I create an official github issue or is it in fact being too picky?