No, if your wallet is on Masternode, then all your coins will not be staked. Because you have to put "staking=0" in the sagacoin.conf.

And if your wallet with only 2500 SAGA, then 7.535 should not be your PoS stakes, because you should get 1+ SAGA per day only with staking from 2500 SAGA. <== Ignore this sentence if you are confused, anyway Masternode wallet will NOT be staked.

EDIT: Conclusion : 7.535 should be your first MN reward.