Could you please clear your browser cache, then try creating a new offer and check if the error message still appears?
After that, you can also cancel the offer by pressing the Abort button and verify whether the Rollback procedure completes correctly.
I just opened from another browser, so far didn't see any error exchange rate notifications, even i created new offer and canceled the offer. But, this Offer ID: 513c491a-5c79-4199-bc90-f8e50c3fcdc8, stuck with status Release ready. as I say, in this transaction, I intentionally entered the mainnet address. In this case, nothing has happened for more than 24 hours, because the address entered wasn't a testnet address. In an incident like this, what should we do next? There must be a solution, whether a refund or automatic cancel or re-checking the address.

suggestionIn this text "Deposit partially confirmed on blockchain" in the transaction details, it would be better to add, "0/2 confirmations for fully confirmed" or something like that. to info user how much confirmations needed to complete. example:
