Adobe Acrobat Reader DC

Need help!  I created a form using Adobe Acrobat 9.  I added a java script in the background to alert the user of any fields that were not filled out, including multiple signature lines.  I tested the form frequently, using Acrobat 9, pro and reader DC, and it worked perfectly.  Now I am getting reports from the users(using Adobe Acrobat Reader DC), that they are getting an error message stating that the signature lines need to be populated when the lines have the signatures inserted already.  I am not Adobe savy, I am just trying to get rid of using paper.  can anyone help?

Thanks