Last modified: 2010-04-09 04:44:49 UTC
This extension adds a new META tag, so the page turns to have two META keywords tags: the one generated by the core MediaWiki software, and the one generated by this extension. The keywords should be added to the core generated tag to prevent duplication.
Please specify which extension. This is filed under [other], so its unclear which extension you're talking about.
This extension is not in Wikimedia source repository, so problems with it should be reported elsewhere - on its talk page or to its developer directly.