Image on homepage only shows up after refresh

[sdotwuu]

On the homepage https://running.goinvo.com/ sometimes the image under "New to GoInvo?" doesn't show up (there's the little thumbnail image). After I hit refresh, it appears correctly (if I close and reopen it also works fine). After fully quitting Chrome, it seems to happen when I first open the page again. In Safari for some reason the image is just not loading at all for me.