Seems that there were a few changes made to the way Facebook parses data from pages. Like buttons on existing pages unliked themselves automatically after clicking the button, flickering for a second.

This problem is probably because Facebook still had the old data for your page cached somewhere, which caused errors with new code. Just make sure your page have all the correct open graph tags, and things should return to normal after a while.

To check your pages and open graph tags, go to https://developers.facebook.com/tools/lint and make sure you don't get any errors. You might have to append some random url parameters to your url to force Facebook to check your page again, and not use a cached version, like so: