redirect headache

[kenfuzed]

I'm having a redirect problem and my host says its something to do with vBulletin. I have 2 domains, one is pointing at the other. My htaccess is correctly redirecting everything except the forum/ directory.
Example;
biker-talk.com or biker-talk.com/anydirectory
redirects to
bike-talk.com
However biker-talk.com/forum doesn't redirect, but shows the contents of
bike-talk.com/forum

Is there something set inside my vb admincp where could have been set?

This is driving me crazy, especially since Google has now indexed pages under this biker-talk domain but not under the bike-talk domain where I want things to be. Ideally I would like only the domain name to redirect rather than redirecting every link back to the homepage.

BTW, I'm running vb 3.6.4 w/ vbadv cmps 2.2.1