For some reason, there are some articles in our knowledge base that do not display for users if they're not signed in. Other images in the same article display fine; it's somehow only an issue for some images. One example is this public article: https://careportal.zendesk.com/hc/en-us/articles/360058117733
Screenshot of what the image looks like if you're not signed in:

And then if you're signed in:

You can find a solution to this issue here: Inline images in Guide articles display as broken across all browsers