Keep getting error message when trying to place order.

[YoosierNoodle]

I'm using McAfeeDex with Trust Wallet and the Trust dApp browser. I can deposit and withdraw to exchange, but when trying to place an order I get an error message saying "Order signing failed." It seems the exchange is communicating with the Trust wallet, but I was under the impression that funds were no longer in wallet after depositing. Anyway, here is a screenshot of the error message:

[YoosierNoodle]

Oh, and I'm using an RCA Viking Pro 10 tablet. I've also tried using the Android version of Metamask, but can't even make deposits with that.