If there is a call of #ifexist: function, then the page that's existance is checked appears in links list, irrespectively to whether it exists or not. It is not important in most cases, but it produces many links and makes [[Special:Wantedpages]] look very ugly when used in "popular" templates.
Source code calling #ifexist may be found at http://ru.wikipedia.org/wiki/User:Kalan/00?action=raw .
Version: unspecified
Severity: normal
URL: http://ru.wikipedia.org/w/api.php?action=query&prop=links&titles=user:kalan/00
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=12019