Encrypted Document

Hi all, 

I could really use some help please. 

I created a doccument on Word and uploaded it to Adobe sign and added in the text boxes/tick boxes etc that I needed to as it is a questionnaire. I emailed it using Adobe sign to a user and they received it in the correct format, however in some of the text boxes the font was huge and I need to edit the doccument to make the font smaller as well as add some more questions. However, when I went to do this, it says I cannot edit the doccument as it is encrypted. I did not encrypt the doccument or add a password so I am very confused.

I'm sure as you can probably tell technology is not my strong point therefore some support would be greatly appreciated.

Many thanks in advance!