I had to fill out work history info multiple times, but I went through two applications and it's been several years. I was approved on my first go around and unluckily it was overturned by audit, even though this doesn't seem to happen very often..

You should be making copies of anything you send them so this shouldn't be that big of a deal. Perhaps you forgot about a job or duties within a job, or a Voc counselor has made claims that are inconsistent with what they're showing as your work history. Who knows? Get it done asap, and depending on where you need to return it to, do it in a way that gives you a papertrail.