Glad to know the issue is not with the plugin. For the one share that is missing, the plugin data does not update in real time – so I suspect that the one share will show up eventually, or you can click “Update Now” on that post on the reporting dashboard to trigger a manual update of the stats.
I’ve found that social networks are usually good about following minified URLs and correctly counting shares. Maybe try using a different URL shrinker and see if you get different results?
For testing, you can query Facebook directly to get the most up to date and accurate information about URL shares by going to this URL in your browser and replacing “https://www.www.remarpro.com” with the full URL to your post:
https://graph.facebook.com/fql?q=SELECT%20url,%20share_count,%20like_count,%20comment_count,%20total_count,%20click_count%20FROM%20link_stat%20where%20url=%27https://www.www.remarpro.com%27
Try the minified URL and see if by chance Facebook is attributing shares to that URL instead. Also try your URLs with and without a trailing slash, and with and without https:// and let me know if you discover anything.