like count disappeared on posts

hi!
i’ve been using this plugin for a year now, without any problems.
but today i noticed that the like count on my old blog posts disappeared…
i used the fb linter check thing to see what might be wrong. first it gave me this error: “of type ‘profile’ is invalid because it specifies multiple ‘og:url’ values:”
i deactivated another fb plugin, and this error was gone.
now it says “Extraneous Property: Objects of this type do not allow properties named ‘fb:page_id’.”
and “og:image is missing. The og:image meta tag is necessary for Facebook to render a News Feed story that generates a high clickthrough rate.”

not really sure what to make out of this, since this doesn’t really seem to be related to my problem. (right?)

i didn’t change anything like the permalink values btw…

is there any way to get the likes back? is this problem related to wordpress & the plugin or facebook itself?

http://wordpress.org/extend/plugins/like/