I want to ask Where i can submit bug report?
Please submit your bug report
here.
An error appeared after I made a transaction with Offer ID: 513c491a-5c79-4199-bc90-f8e50c3fcdc8. There was no exchange rate error notification before that transaction.
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.