Submitted by csanuragjain, also found by MiloTruck
\_requestWithdrawalFromTokemak function :: Instead of sending amountToRequest for requestWithdrawal, contract is asking _amount for requestWithdrawal. This becomes a problem when balance < _amount and only balance could be withdrawn
Modify Staking.sol#L326 to
toshiSat (Yieldy) confirmed and resolved 
