As shared above, currency symbol and decimals disappear anytime you are ready to send for signature. Also, when you click on Fill & Sign it isn't visible properly.
In that case, you need to check the form field's properties (format and common properties) first. Was this form created as PDF using Acrobat DC or it was in any other format and then exported as PDF from third party application?
It would be more clear, if you can share a sample PDF with us.
"You can share the file with us via email. And you can send it to the email address that is shared via private message. Please do mention your forum thread in the subject"