USCIS FORM password protected after filling and renaming--it is not locked in my other computer

Hello!

As the subject reads, after I filled out pages of a USCIS Form (N-400) and renamed it, the document is locked, and can't see the form at all. I have Adobe Acrobat installed. However, i downloaded the form and did the same to thew form in my other computer is not locked. 

Any insights and help here are very much appreciated!!!