At https://wikitech.wikimedia.org/w/index.php?title=Template:Archive&action=history (and other History pages on Wikitechwiki)
in the "Filter revisions" box at the top of the page.
it is displaying a part of the word "expand" or "collapse" at left, and the label "Filter revisions" has been misplaced at the right.
It should look like this: https://www.mediawiki.org/w/index.php?title=Template:Archive&action=history
Replicated in Firefox & Chromium (on Mint linux), logged-in & -out.