The ETH wallet in Coins.ph is designed as a smart contract in order to add security features that protect your funds. Transactions sent from smart contracts are structured differently than those sent from externally-owned ETH accounts. Because of this, some external ETH wallets are not able to pick up transactions from smart contracts.
DISCLAIMER - It is your responsibility to verify with your wallet provider that they can accept funds using smart contracts. Funds successfully sent out of your wallet are final and irreversible.
Read more here for information on how to send cryptocurrency such as ethereum from your Coins.ph wallet.