Asked to send edited and signed document but won't save

I'm having a problem with a document I've been asked to fill out, I've filled out the document, I've signed the document, and then clicked on 'Done Signing' The prompt to save comes up, but when I go back into the system, I find the file is not there. It prompts to save the document with -signed on the end of the original document. I've tried saving onto the original but no luck. I originally sent the document and was told it came out blank.

I'm using version 10.1.5.

Any help would be appreciated.