can't change header image (Hemmingway theme)

Hi everyone,

I′m using the Hemmingway Rewritten theme and change the header image (customize->header…there I uploaded a different sample picture). Now I would like to change the picture back to the original header image of this theme. So I click on customize->header…

Under “current header” it says “no image set” (eventhough my sample picture is displayed on the blog). I click on the suggested picture (the normal hemmingway header image) and then on “save”. On the left side it says “your design has been published”.

Yet, when I visit my blog, my private sample picture is displayed…:(

But I want the Hemmingway image back….Thanks for your help!

Blog: translicity.wordpress.com