I think it may have to do with an account I created on Stardock.com many years ago and forgot about. Then later didn't recall that I had made an account and used a different email address to create my now "main" account.
When I purchased it via the website, it automagically used my paypal account which is technically in their system as a valid user.
May or may not be that but that's the excuse I'm giving them. 