atomic coin forked

[gurjeet007]

Hello
i forked atomic   for learning process
its pow/pos hybrid coin

but during testing i found that
i start cpu miner with rpc user and password without coinbase address
i found there is strange behaviour i found
mined coin  transfer to newly created address
and also some going to default account

after coinbase matuiry
blocks are minting
when i create new address
coin which are not mature that coin transfer to new created address
why  its happen can some help me out to understand