Sometimes, ad blockers can block images. This is because ad blockers identify all scripts on the page; images are picked up and can block these. If you're using an ad blocking extension, please make sure this is turned off.
Additionally, sometimes a publisher may be using a CDN to serve static images, and since Ezoic doesn't have all of the DNS records, it can cause images to not show. This can be resolved by updating Ezoic's copy of your DNS records to reflect the fact that you are using a CDN to serve static images.
Lastly, Leap can sometimes cause issues, which will need individual troubleshooting. Start by turning off all other image optimization plugins. If images still aren't loading, try disabling Leap's image optimization features one by one in order to identify the problem feature. In almost all instances, you can exclude images from being optimized by file or URL in order to resolve any issues, but very occasionally the offending feature will need to remain off in order for images to load.