My Custom Sized Images are not Displayed

There are some settings in the customizer to allow you to add a custom size for your blog images or related posts images, the images are sized on the fly, that means, they are not stored in your database to not bloat your site. The problem is if you use a CDN, as the images cannot be retrieved, they will not be displayed on your site. To solve this problem, you just need to go in the customizer to remove the custom size that you have added for your images.