Your promo-tweets are showing the same image day after day.
One of these fixes will solve or explain your problem in 99% of the cases.
1. Check the tweet text field in your paper settings. If you are promoting your paper URL here, is the paper URL typed correctly? Check that you have the full URL of your paper saved in the tweet, including the prefex https:// i.e. https://paper.li/yourpaper.
If your paper URL is typed correctly, an edition id will be added to the URL, shown below in the preview window. The edition id is necessary in order for the most updated image to show.
2. In the Tweet text field, are you promoting a URL other than your paper URL? If so, Twitter will show the image and description from your own URL source code (if you have saved one using twitter meta tags).
3. Be aware that if you include any other URL besides your paper URL (for example: a URL shortener or a snip.ly for your paper), the most recent "meta data" for your paper is not being sent to Twitter. This will result in Twitter displaying an incorrect image for your paper on most days.
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