Sometimes you make changes to your app and when you share the app on Facebook, the changes are not reflected. This is due to the way that Facebook caches information and images and doesn't reuse the source. Usually over time (weeks) FaceBook sorts this out and starts to use the correct info.
You can force Facebook to reset the cache by going here:
Once there, enter the URL of your app and click Debug.
Then click on the "scrape again" button to refresh the cache.
Everything should be working correctly when you share the app on Facebook.
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