special characters showing up in library but not on form

Hi

I have a nintex form with a multiple lines of text field (no rules or controls set). After submitted, the column in the SharePoint library that is linked to the form shows a special character (?) at the end of the text. This special character is nowhere on the nintex form (verified that there were no spaces after the letters on the form). Can I code this out or is this a validation issue? Or something else?