I'm trying to book a flight from MLI to HKG on delta.com with +/- days option. When I select 12/21 - 12/31 I got this

http://i51.tinypic.com/9zucnb.png
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Delta 3876
Moline-Quad Cities (MLI) 1:30pm
Detroit-Wayne County (DTW) 4:09pm

Delta 27
Detroit-Wayne County (DTW) 3:40pm
Hong Kong (HKG) 8:45pm
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I ask live chat if it was a website bug or can I book the flight and their reponse was:

"The flights are scheduled by the ‘Schedule Department’. They keep the minimum connection time required at each airport in mind while preparing these flight schedules. Elements like distance from the arrival and departure gates are also considered while preparing these flight schedules. When the connecting time is less, the gates are usually in the same terminal which saves time so you should be just fine."

"You can book the specific flights."

Called Delta and CSR told me that the flight is for the next day and that I would be overnighting in DTW.

Whats going on, can I get the flight or not?