Forum NavBar display issues:
 

I've got some NavBar issues. When a "tab" is active, the image (or highlighted bit) isn't showing what it should. It's not a theme issue as this is present whatever theme or skin I'm using for my forums.

2 images attached. First is what it should look like, second is what mine looks like. Thanks for any future help :)

EDIT: It was like that when I first installed the theme, but after a couple of refreshes it went funny. Can't really remember if I did anything to the core files but it's a possibility.
Attached Images

• http://vb.ma7room.com/png.gif Navbar "should be".png‎ (44.4 KB)
• http://vb.ma7room.com/png.gif Navbar issue.png‎ (73.0 KB)