Been through that. There are two possibilities. Assuming you input everything the same, and used the same category - "Trade in Value."
1. The value may have dropped. When updated, it just happened during the intervening time. Hass to drop sometime, your tough luck, though I can't see $2000. all at once.
2. This is more likely. Got to watch those dealers. One trick they pull is to knock down your >>condition<<!! Note at the end of your input you have to rate condition. There are about five categories (didn't have time to do this this morning): excellent (no dealer will give this, even if the car is excellent); GOOD, which is aboput the best you can hope for; FAIR, which they generally try to use, and one or two lower than that. If you have rated your car GOOD, and have that value, the dealer can input all the same stuff, just checking a very small, easy to miss bullet point FAIR, and present you with a very official looking page with the screw-you value.
Simple trick. Like I said, been through it.