Again,
Just reset the BBPress forum and everything turned right.
Hope you have a nice day @Robkk
Thank you Robert.
However, I tried to delete all custom CSS related to BBPress and even reinstalled the BBpress itself but nothing change. I just want it to be normal, not be located under the avatar. Please guide me a little more to fix this issue.
Sorry for disable the link. Now, use can access it http://pharmdiary.com/forums/topic/webboard-rules/
Thank you