I was surfing around both Super User (and Meta SE for testing), and noticed if you click the link for "Last activity", it comes up with a 404 error.
Clicking that link shows the lovely 404 page:
I can't reproduce this with the current list of top questions here on meta. Can you give more details? Is this after clicking the "N new questions" banner, or is it just after first loading the page?
I recorded a GIF, went to edit this question, and I'm getting the Meta 404 error now. Anyways, it seems like it's only for modified questions, not freshly asked questions. I'll upload the GIF somewhere and link it
@ShadowWizard not if I'm not on my work computer. Also - need to actually go through the logs to do that... and asking someone is faster/easier to do ;)