This is driving me mad, I have a facebook like button on my site http://www.myabandonware.com/, and the button have been showing 0 like for the site when logged out of facebook. When logged in, the share count is 5k.
When refreshing the page, I get sometimes 4.7k likes instead of 5k. I have checked the share count with the API.
Sounds like a bug to me, should I file a bug report on Facebook ? This is maybe temporary, I've started the delete procedure of an old fan page that got 200 likes.
EDIT : this went back to normal behavior, I suppose this was due to the old fan page (automatically created around 2009 I think) being really deleted (after the 15 days allowed for rollback). The link count lost the ~200 fan of this page. I permanently deleted the fan page this morning.