Transaction declined but still shows up as not declined on statements

Hi,

We have a Magento 2 site with Magenest Moneris plugin.

We have configured all the CVV / AVS checks.

After testing a declined transaction(Magento side has declined it), it still showed up on credit card statement - this is completely baffling to me. How is that possible?

Do we need to configure CVV / AVS checks on Moneris side?

Are there any guides on how to configure this?

Please let me know,
Test4321