It doesn’t matter if they’re related to Replit, they can still mess with things. For example, on Chrome, on nixos.org, where I go to find Nix packages, the search feature loads infinitely in Chrome, but works fine in other browsers, because of my Chrome extensions. None of them are related to Nix, but they still manage to break the page.
You might be zoomed in too far, or your screen resolution might be low or something, but I cannot reproduce this. This probably is the closest answer you will get to an actual solution sense no one can re-create it lol.