AEM forms field pattern rendering on DocuSign portal

Adobe Forms Designer 6.2

We have XFA based PDF forms designed in Adobe Designer and using workflow process we are prefilling the data for forms using binding.

Forms are using display pattern on few fields like account number , date in mm/dd/yyyy, SSN. These fields when prefilled with data are retaining display pattern when viewed on acrobat pdf or chrome, but issue is DocuSign portal is unable display in right format and stripping off any pattern.

However when PDF is modified manually on top of that prefilled field then data pattern works fine on DocuSign portal.

Anyone aware of what is the possible reason of this different behavior? and how to fix this.

Thanks

Manu