That's what will happened if you sideloaded mobi file not bought from Amazon. In my experience, the only way Kindle app show cover correctly is when you're only put one mobi file in it. It will not have the problem that you describe (and I have it too). My workaround is this: put only one books that you want to read now in eBooks folder and you create another folder that contains another file of your book. Kindle app won't read that.
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