Huge blank areas on mobile page

Hi there! Something strange has happened... and I don't know why. When I access my blog meine-frau-ist-schwanger.de by mobile phone (iPhone 5s, iOS 10.01, Safari and Chrome) I suddenly see huge blank spaces on the start page before and after the "featured" area. Furthermore there are blank spaces in my first post (after paragraphs). Does someone know what has happend and how I can change this? These bugs both don't occur in desktop view. Regards, Tobias