I can confirm that recently approved TPS is having validity date until Dec 24, 2018. DHS extended TPS until June 24, 2018. So, Why is USCIS sending approval for 6 more months. Really confused on this. Do anyone have any theory on this?

I have confirmed 3 cases with validity date until Dec 24 2018 but these were the case filed in initial period and got the approval in December 1st week. As the approval for re-registration started to roll out, I was wondering what these lucky folks have in validity end date?