I get this happening when I Mouseover a post:
The upper section appears when I Mouseover a post, and updates when I Mousever a different post.
(Only happens in "Your Posts" as I'm aware).
Up to date Firefox and all that.
Edit: Seems like it's only an issue on the ffxiv.zam skin.
Edited, Apr 16th 2012 3:16am by Kirby