Maybe your pinch rollers are restricting your width?
1. Scan the media with the pinch rollers WIDER than the media.
2. Open the pinch and bring the pinch rollers in closer or onto the edges of the media.
3. Hit CONTINUE or #4 on your control panel. You now have max width available to cut...but you need to be careful!!
If you're talking about the length...say 1 inch from the lead edge of the media, thats the media eye/ scanner at the front.