Keynote to Powerpoint still shows blue links

Hi, When I export my Keynote which contains wikipedia links, to Powerpoint the problem occurs when I open the converted presentation in Powerpoint because here my presentation now shows the blue wikipedia links although I removed them using keynote!

Its very annoying that they appear in powerpoint, I can only use keynote to edit so surely there must be a way in Keynote to stop this happening? Thanks.