It's everything OK, you just need to wait to coin mature again for staking, be patient and split your coins after next staking to smaller blocks, like let say 150 coins per block ! They will staking more often !
Or just leave alone like this, they will split automatically, in the options you have Coin Control, add that options and than go to Send and there you will see Coin Control, so you can clearly see what happened with your coins and how are they split.