Featured Slider – Image leading to error page

Hi there, we are using the amazing catch everest theme in our travelblog http://www.bayerwaldberge.de for a few days now. But there is one problem concering the featured slider: if you click directly on the picture in the featured slider, you are directed to an error site ("Oops - that page can't be found"). The problem is that there appear the signs %22 an the end of each link of the featured slider image. EDIT: I just figured out that the signs %22 appear when using Apple Safari Browser. When using Firefox, the sign " appears at the end of each link - same result: Error page But, if you click directly on the grey text area of the featured slider, everything works fine and you are directed to the post. Any idea how to fix this problem? Thank you very much in advance! Best regards Daniel