Facebook share isn't working right.
Sometimes pictures don't show up or show up incorrectly on Admin accounts when using Facebook share. Usually this is an issue on Facebooks end. You can try troubleshooting with their scraping tool:
You can also troubleshoot by seeing if the incorrect photo shows up on a Google Chrome Incognito window, clearing your browser history and temp files, and restarting your computer. If this doesn’t work, it is probably an issue with Facebook caching and should be resolved within a day.