You might have ordered from another Adobe ID. Check and confirm that the email address where you received the reminder is the same as the Adobe ID from which you ordered.
If you have more than one subscription, you receive payment reminders separately for each of them.
View your subscriptions on the Plans and products tab of your Adobe account and check if payment is pending on any of them.
If you have subscriptions on different Adobe IDs (usually your email addresses), you might have received a payment reminder for a subscription on another Adobe ID. Ensure that you are signed in to your Adobe ID account with the correct Adobe ID.
If your credit card details (for example the expiration date or address) have changed, you would have received a reminder because the payment could not be processed. Learn how to view and update your card details.