I've tried switching between flattening the forum categories and not but I am unable to see the problem.
Here's some screenshots to (hopefully) show you whats wrong with them.
Elemental Dev Journal page (working):
Elemental General sub-catergory (not working):
Sins General sub-catergory (not working):
Sins modding catergory (not working):
All of those are with the forums unflattened. The correct stickied threads show up, but everything below them is the Elemental Dev Journals. For myself and a number of other people, using the flattened forums option will make everything back to normal. Also note that it is not exclusive to those 3 sub-forums, it's all of them. I just chose those to take screenshots of.