Logo image link/loading broken

Suddenly (think it started yesterday) my logo image (I’m on a Retina screen) is not loading/showing anymore.
When I untick the setting “Optimize images on the fly and serve them from Shortpixel’s global CDN.” it’s there again.
When I go to the “Customizer” it is also appearing normally and the url/link on my website is valid.

The page I need help with: [log in to see the link]