AP check template MICR Font is showing as square boxes

Summary:

I am working one of the Saas Customer and trying to customize the AP check template. Existing custom template was build by Solution Implementation team is working fine. I tried to use the same template just changing the Address and Bank Details. Now with that template the MICR is showing as square boxes. Now we are following the work around that we are opening the rtf template in the note pad and make the necessary address and bank details changes. What we observed is if we open that rtf template in the word document the MICR is getting corrupted.