Tydskrif pictures question marks, help

So this does everything I need but the latest post/sticky box floating at the top left of the theme does not show the picture from the post…just a pair of hands cupping the earth. Been scratching ,my head for hours but other themes don’t cause the same problem so guessing the issue is with the theme and not my pictures. Gonna have to score this low unless I can figure this out. https://www.thestinker.com