Sharp money may be coming in on Oregon to cover. I haven't looked up the stats. That's what you call reverse line movement - when the largest percentage of the number of bets are coming in on one side, but the majority of actual dollars being bet favors the opposite side of the line, in this case causing the spread to move in favor of Oregon.
Basically, big money bettors fading the public opinion/IU.
And basically, some deep and/or dumb pockets are gonna be a little more shallow at the end of the night.