Young bunny

Hi, i got myself 2 little baby bunnies a month ago. 1 loop and 1 dutch rabbit. They're only merely 2 months old now and recently noticing them start mating. Is it normal for 2 months old bunny?

Very likely.
   
A rabbit is a prey animal - it's lunch for every predator out there, so they have to reproduce quickly.
   
Unless you have the male castrated, you're going to be up to your ears in baby bunnies for years to come.
   
I suggest you get the male fixed.