Payment for two years ,but getting less than two years. why?

Hello Gerald. 
Thank you for contacting AVG Community Support.
I will surely explain about it.
It seem you have misunderstood the next billing date with expiry date.
The date that you are you are seeing is a next billing date not expriy date.
You will be billed 30 days before the expiry date, so that you will have a continuous protection without any interruption in service or security. You will aslo get renewal notification email with charge date.
Though you have been charged one month prior the new subscription begins automatically at the end of the previous subscription only. 
Thank you.

Today I paid for two 2 year subscriptions on 06/03/2024, but my next payment is on 30/01/2026, 
Why is this ?

Hello Gerald. 
Thank you for contacting AVG Community Support.
I will surely explain about it.
It seem you have misunderstood the next billing date with expiry date.
The date that you are you are seeing is a next billing date not expriy date.
You will be billed 30 days before the expiry date, so that you will have a continuous protection without any interruption in service or security. You will aslo get renewal notification email with charge date.
Though you have been charged one month prior the new subscription begins automatically at the end of the previous subscription only. 
Thank you.