Remove ShortPixel CDN redirects

that happens either because you ran out of (free) credits (in which case you need to sign up, add credits and associate your domain) or because shortpixel isn’t able to fetch the images from your server (due to the site not being reachable from the internet or firewall restrictions or image hotlinking prevention or ..).

if all else fails disable Image optimization on Settings -> Autoptimize -> Images?

hope this helps,
frank