How do I remove the duplicate meta tags and descriptions found in the HTML Improvements tab on GWT?

The issues reported are because some people were linking to us with spaces or dashes in the URLs instead of "+" or also without the trailing slash.

I have fixed these issues by permanently redirecting the errant URLs which can be proved with the Fetch as Google, but these issues are still appearing as issues on GWT: why are they still there? and how can I remove them (there is no Mark as Fixed)?

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Correct: http://digiguide.tv/pick-of-the-day/26+August+2008/documentary-dont-tell-the-bride-laila-and-nick-is-this-what-lalia-really-wants-on-her-big-day/

Broken: http://digiguide.tv/pick-of-the-day/26-August-2008/documentary-dont-tell-the-bride-laila-and-nick-is-this-what-lalia-really-wants-on-her-big-day/

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