Perplexing poltergeist: image won't leave

We have a course that contains an image that we're trying to change via change picture. No matter what we do we can't get the old picture to leave. Even if we delete it. When we preview, the old picture remains. If we publish, the picture remains. We have other pages that have the same exact layout and those pages work. Two do not. I've never seen anything like it before. Has anyone experienced this? I can't publicly share the file. 

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