Posting in multiple colors doesnt work with WYSIWYG intrface

When someone posts in forum http://maja.up-with.com , and he uses a WYSIWYG interface, if he uses multiple colors in a single post,
the output comes in a single color of the first color used and the tag "[/color]"
appears for every color change.
When u shift to the normal editing mode and see, the tags would have been scrambled while editing in the WYSIWYG interface.
Please rectify this problem sir.

Please reply if iam missing something or you have any doubts.

Thanks!

Actually, that shoould work... Mabey its just that the WYSIWYG was made different that the bbcode parse itsself