While coding a new module, I was making it's templates use the standard .item css classes in XOOPS theme. However, many of these new XOOPS themes don't properly address .item (color wise) so even though a module uses .itemHead it will not display according to the rest of the site. The default XOOPS theme has this done right.
So, when I release my new module and it seems to be lacking color in your theme, now you know why

Is this easy to fix Kaotik?

Yes it is. I'm going to change my module templates to use other css classes instead. That way it should display properly colorwise.