On March 25th 0:15, the Catalan Wikipedia redirected all pages to a blackout page (https://ca.wikipedia.org/wiki/Viquip%C3%A8dia:Comunicat_24_de_mar%C3%A7), by changing Mediawiki:Common.js (see https://ca.wikipedia.org/w/index.php?title=MediaWiki:Common.js&action=history). Later that day, the change was undone, and the redirect (to a different blackout page) was performed via Meta's Central Notice. The whole thing got undone on March 26th.
However, the Pageviews tool still shows around 1700 hits per day on the first blackout page. See https://tools.wmflabs.org/pageviews/?project=ca.wikipedia.org&platform=all-access&agent=user&range=latest-20&pages=Viquip%C3%A8dia:Comunicat_24_de_mar%C3%A7. I thought it was perhaps a malfunction of the pageviews tool, but I have actually seen a friend of mine (from an iPhone, with Safari), trying to access an article after a Google search, and getting the blackout page. The same person accessed other articles seconds later without any problems. However, almost a week later, the first article still got blacked out.
Any idea on what may be happening?