Just checked again 2 weeks later. Orbitz is still advertizing one price (similar to two, three and four weeks ago, but is offering another (similar to two, three and four weeks ago)

1 traveler - multi-city
We're sorry, the fare has increased. This is due to an airline update, a change in availability or a technical issue. The new total is shown below. (Message 102a)
Total airfare $1750.71
Service fee $10.00
Total trip cost

$1760.71

THis is not just a slow update. It must be a deliberate attempt to get business by upping the price it quotes rather than a person having to reenter the date in a different search engine. Well, they have lost my business for good now.