My advice, don't trade at Coindeal! I've been trading for months there and the platform is very unstable, withdraws/deposits take far too long sometimes far mor then 24 hours!!), every day empty hot wallets, fake volumes which they create themselves and so on. Don't do it, you will be sorry!!
Some of the exchanges with huge trading also have the same property like you mentioned but I don't trust them because why they need huge time for the transactions to be approved.Use Biance which is the most safest exchange for now or just go for DEX!