I've had problems with Delta's site before -- doesn't matter what browser or device. It happened some years ago when there must have been an upgrade.
I definitely see that deeply discounted line. Sadly, what I don't see is any Delta MQM credit for fare classes Z, P or N -- all of which are the only cheap fares offered. (For anyone looking for the actual fare class -- Orbitz offers the easiest look. Even AirEuropa.com won't show you the fare class before purchase.)