Why is the block reward on it's third semester all ready, even that only around 2.1M BWK out of 14.5M first year BWK is mined?
Block reward is still currently 50.
Masternode rewards increased to 25% of the block reward, meaning 12.5 BWK of each block is going to masternodes, and the remaining 37.5 is going to miners.
Though it's important to keep in mind that in approximately 17-18 days, masternode rewards will increase to 33.3% of the block reward. Then another month (approximately) after that, they will increase to 50% as the quarterly block reward decrease takes effect.