How to solve order total and invoice total mismatch?

I am using this extension for adding extra fees,

In checkout page,

Order total before creating invoice,

After creating invoice,

Error : The invoice total and order total not matching in invoice,

Customer feel order total & invoice total different, How to manage this case?

FYI – If i try with fresh magento, extra fees showing on order total in order page and invoice & order also same total.