Moderator action
I have moved your post into the established thread discussing Chase's travel booking portal which is operated by Expedia. If you scroll back you will find a curious mixture of experiences in which some people are very satisfied, while others find limited inventory and uncompetitive pricing.
Are you trying to book more than one seat?
Which Chase card account are you logged in to when trying to book? The value of points varies by card, and if the agent doesn't know which conversion rate to use that might account for inaccurate telephone quotes.