the fee in the end was 0.09 dollar for a erc20 transfer to trading, but my points still stand.
Im unable to edit the above topic due to a image post limit.
We are looking into better fee estimation, but the reason personal to external fee shows much lower @Konijntje is because that is a simple transfer.
Deposit and withdrawal are not the same as transfers to and from external wallets, those are actions that call the smart contracts to establish channels and for that reason will always be more expensive than a simple transaction. As that is more expensive in the network itself.