The two blocks you forged probably didn't have any transactions inside! I've had a few like that so far with 0 transactions and 0 fees, I got lucky and hit on one that had 3,000nfd as a fee...
Myself, I got lucky with forging N2. One block's fees were so big, I scratched my head and wondered, "who sent me that?"
But of all 13 N2 blocks I've forged, only two have had fees greater than 10. Eight of the blocks have had a total fee of 1...