Lost my warranty ???

Hi all,

I bought a Dell Venue pro 11 in June 2015. When I checked it warranty status, it was under warranty until 2016 or 2018.

But now, when check again, there is nothing. No start day, no end day, ... nothing at all

I also check my other Dell laptop. It is out of warranty but still has other details

So what is wrong with my warranty? Anyone has idea abt this

I really need this warranty because my dell venue has problem with the fan, it is too noisy when working. 

Thanks