DNS entries type UNKNOWN with my dns server suffix ???

Guys, what is going on here, started to appear some entries on the dns cache with unknown type. The weird thing is that has the suffix of my DNS server.

My mikrotik has the dns pointing to my dns server inside my network ( win 2012 server).

What kind of virus / attack / what so ever we are talking here ? the problem is in on of the machines inside the network or the server ?