Adobe Sign - when signing several documents, each doc gets renamed

When I use the "fill and sign" option and I upload several documents, after I sign and download them the name of each documents changes (the name of one document is used to rename the rest of them and also  "part 1", "part 2" etc gets added), and I have to rename each of them which is really time consuming.

I would like to know if there is any way to avoid this, and to have each document retain its original name after I signed them.