That is a technical glitch. Extended warranty is provided by external agency Servify. Due to increasing number of motherboard issues in Samsung phones, external agency has just decreased the number of days to 300 days from 365 days or 1 year. For you...
I want to inform you that Samsung has changed the policy for extended warranty. As per the new policy, the extended warranty has to be bought upto 300 days from the date of purchase.