Different dates in my SDL Trados Live and SDL Machine Translation Cloud accounts

I purchased Trados Studio 2021 Freelance on November 28, 2020. The Account Information tab of My SDL Trados Live account shows that the subscription expiry date is November 28, 2021. However, the Account Quick Summary on my SDL Machine Translation Cloud account indicates, "Total: Usage counted since the creation of the account; Current: Usage for the current billable period: 2020/10/16-2021/10/16." I don't understand why the dates are different. Can you provide an explanation?

Thank you.