The "Page title matches" and "Page text matches" search results are weirdly floated next to each other, as initially reported in T87631#1861470 (with screenshot).
rMW35b6a6dcf9e6c6d5d132fa0cb0e01308b65a3b02 (released in 1.26) seems to have caused it.
On wiki.archlinux.org we have temporarily solved it with https://wiki.archlinux.org/index.php?title=MediaWiki%3AArchlinux.css&type=revision&diff=413658&oldid=373909
T119879 might be related.
Screenshot:

