Recover coins sent to trade wallet

I started to create a trade offer and sent BTC directly to the trade wallet address in the GUI. When the button to finalize and create the offer appeared, I clicked it but it gave me an error message saying it couldn’t do that yet. Then that button disappeared and the UI appeared to be hanging so I clicked cancel so I could try again. Now it’s giving me a completely different address to transfer to and I don’t see a way to either reuse the old address or move my coins into the new address.

How do I get my coins back?

As I understand, you deposited your coins in the Bisq internal wallet.
If there is some software issue and you can’t send your bitcoins that are in your Bisq internal wallet (you should check with the block explorer if your transaction did confirm), then you can always use the emergency wallet tool by pressing cmd+e.