Double Dropdown Arrow?

[Snakehill]

Whenever I am on the homepage or in a thread of my board, the menu looks

, but whenever I enter a subforum, suddenly a second arrow appears next to 'Message Board' as seen in

.

Anyone any idea what causes this second arrow and how to get rid of it?

Much appreciated! Thanks a lot!

EDIT: Never mind! After a lot of fiddling around I figured that there was a vbmenu_register for the menu in both 'FORUMDISPLAY' and 'header'. Disabled the header one and the problem was solved right away.