There can be a couple of reasons:
1. If it's an image you uploaded in the Console and inserted it in a page, then it may be that you deleted that image from the system afterwards at some point. This makes the system to no longer find the image and thus use a placeholder in its stead.
2. If it's an external image that you inserted with a link, it may be that you are using an http URL for the image, which is not secure. As such, the browser does not show that image to visitors of your website, for security reasons. So, make sure you are always using secure (https) URLs each time you insert an image using an external URL (an image hosted on a different website).
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