Hi,
If two different channels show up with the same name (which, from your description, seems to be what's happening), then VinylStudio will get confused. There's not a lot you can do about this I'm afraid - it's just not supposed to happen!
You could try complaining to Creative, or perhaps posting a message on their forum (I assume they have one), but I doubt it will help. Alternatively, ASIO4ALL might be able to handle this, although it may also get confused.