Forum FB "Like" works, but not sticking over time... Session String in URL?
 

It seems that when I "Like" a FB Article, it only shows as me liking it for a short time, then when I return to the page later, it prompts me to be the first of my friends to like it.

When I hover on the link on my FB page, there's a session string appended to the URL. Is this expected behavior? Any ideas or causes?