Hi @banja
Thank you for reaching out to me!
WC Moneris Payment Gateway plugin is fully compatible with version 4.0.1 and I have just placed an order without any issue with the same address that you have shared in the screenshot. Are you using any cache plugin or some optimization plugins as well? Can you clear cache, and temporarily disable both cache and the other plugins and then save the api settings again and see if that makes any difference?
With Regards,
Akshaya Swaroop