Sorry.
So the explanation is that the forum is meant to be browsed ONLY with the sidemenus, not with the dropdown ones because the side ones are much more clear and as a result of this the .css code of the forum (the graphics) is coded to work properly just with the sidemenus.
I already set that as default but you registered earlier than the day I did that, so your forum was still showing up with the dropdown menus for you, I manually edited your profile to fix it.
Besides for anyone having the same problem in the screenshot you posted there is an arrow in the top right of the profile view, just at the right of the "Actions" tab, if you click there it will switch the layouts and will use the sidemenus
Or in the "Look and layout" area, in your profile, you will find this "Use sidebar menus instead of dropdown menus when possible." - be sure that it's checked. (What I did in this case was manually checking it for DownFall - yes I can do that too
).
On my to-do list there is something that will remove the dropdown layout completely, or at least the ability to switch to it so things like these won't happen again.
Hope that this clears things out, I have tried to be as simple as possible