Last modified: 2008-10-10 06:06:18 UTC
Someone in the past placed on pl-wiki Main page ([[pl:Strona główna]]) speedy deletion template. This template adds pages to [[pl:category:Ekspresowe kasowanko]]. Template was later removed - no problems so far. However if you are viewing older revision of this page ( http://pl.wikipedia.org/w/index.php?title=Strona_g%C5%82%C3%B3wna&oldid=13107949 ) you are putting this page back in that category so it appears in [[pl:category:Ekspresowe kasowanko]].
Fixed in r41923; this would have happened in cases where the category was added by a transclusion and cascade protection was on. ("What links here" was also affected.)