Sources not displayed for an image
If sources are not displayed for specific images, but for others or other posts it seems to work, please check if the image is correctly associated with the post and vice versa.
Go to Media > Missing Sources and try the debug functions “list post-image relations” und “list image-post relations” to check if the image is associated with the post and the post is associated with the image.
There is currently not an easy way to fix it, if one of the associations is wrong, but to remove the meta fields “isc_image_posts” and “isc_post_images” from the database. We are working on a fix that can also be applied by less technical users.