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Sounds like you might have an extra password key for myspace saved in your keychain. Try this...

Open up KeyChain Access, this is an app located in your "Applications > Utilities" folder.

In here look for any entries for myspace, they should also include the username at the end of key name. Remove the one that matches the unwanted username, go back to OmniWeb and reload the myspace login page. You should now see the correct Username.