i’ve repro’d on Meta but it’s harder to do i think because of the related and suggested topics footers (which i don’t ‘t use on my forum). note the navigation sidebar menu and header do not shake.
for me, i noticed that the shaking doesn’t happen when i have the navigation menu sidebar in a collapsed state. so i wonder if it has to do with the expanded menu.
Hmm, the problem I fixed only affected short topics, so this might be something else… have you seen this on Meta recently @Lilly? the fix in question was applied here 4 days ago.