A difference between the payment dates

Hello!
In my profile:
https://subscriptions.avast.com/
the information is as follows:

My Subscriptions
Only paid subscriptions will appear here.
Avast Premium Security (formerly Avast Internet Security)
Period: 1 year
Available for: 3 devices
Subscription status: Subscribed
Next charge: January 8, 2020
Activation code: --******

And the information in:
https://store.avast.com/
is the following:

Here you can view and manage your subscriptions
Your subscriptions
#1
Avast Internet Security - 3 PCs Upgrade
Subscription period: 1 year
Devices: 3 PCs
Quantity: 1
Subscription ID: 99999999999
Your activation code: --****** (same as above)
Subscription status: Subscribed
Next charge: 10 December 2019
Price: €89.99 / 1 year + Tax
Next subscription period: 1 year

What is the difference above between the payment date for the next 1 year period:
Next charge: January 8, 2020
vs
Next charge: 10 December 2019?

The avast application deadline in Windows 10 is (Menu ==> My Subscription):
Renewal date: January 8, 2020

I would like the payment for the next period not to be automatic and to be in January 2020.
I want to subscribe for the next period to only 1 PC, not 3 PCs.
What do I have to do to make it so?

Thank you in advance!

https://support.avast.com/article/24/ (Orders/Renewals/Refunds)