Sorting with topic works not good

I think there is a bug with newest advanced forum, I've installed today dev version.
My modules are:
Advanced Forum 6.x-2.x-dev (2011-january-15)
Views 6.x-2.12
Author Pane 6.x-2.0

It's all about sorting forums. For exaple:
go to forum page http://sky-watcher.pl/forum
and we have forums called "Glowne", Artykuły, sprawozdania, relacje", "Zdjecia" etc.
if you will click on it it will hide properly, if you will click it once again it will unhide properly too
But.. If you will click on subforum such as:
- "Sprawy organizacyjne"
- "Ogólne "
- "News"
it will hide main forum and go inside. Then click again upper level - this forum is hidden. It's strange for me, can you examine it? I do nothing change in my modules, only i've uploaded new advanced forum.

Is there any way to disable this "sorting things" in settings? I've never find it.

@Michelle I hope that this isn;t hijacking and I wrote in the right place. Sorry for bothering you

Regards,
P.