this is a Yiimp based pools problem, it seams, as i'm having weird block reward values pop up also...
currently, it says 0.
For our pools out there, please note the following......
(link:
https://github.com/guncoin/guncoin/blob/master/src/rpc/mining.cpp#L685)
github.com/guncoin/guncoi
That's the masternode and developer additions, those must be added to the coinbase on blocks after the fork if they are present in getblocktemplate.