Blame The Printer

According to Wikipedia:

In the United States, Independence Day, commonly known as the Fourth of July, is a federal holiday commemorating the adoption of the Declaration of Independence on July 4, 1776, declaring independence from the Kingdom of Great Britain. Congress approved the wording of the Declaration on July 4 and then sent it to the printer. Whether John Hancock, or anyone else signed the document that day is unknown, because that document has been lost—presumably destroyed in the printing process. Hancock's name and that of a witness do appear on the typeset broadside that was published within a few days.

The Dunlap broadsides were the first published copies of the United States Declaration of Independence, by John Dunlap of Philadelphia. On August 2 in the following month, an engrossed document in script form was signed by Hancock and other delegates.

{image above of Dunlap's broadside is from Wikipedia}

Happy Independence Day.