Renewing Subscription Question

On my norton internet security, i have 98 days remaining, if i click on renew, a box pops up saying:

 

To renew your existing subscription, please click renew my subscription. Your remaining 98 days will be added to the new subscription period

 

I thought that if you renewed, you dont get to keep the remaining days on your subscription...Is this something new, or is it an error on nortons part?

 

Thanks