What does the routing line on your ticket receipt say? Is the intermediate stop mentioned?
Not yet booked, looks something like this:
$417 Roundtrip
3 tickets left at this price! See details
8:00 am Depart Chicago (ORD)
Arrive San Francisco (SFO) 12:30 pm xxx xx-xxx
Duration: 6hr 30mn
Ted Ted Ted 1433 operated by /UNITED FOR TED1433
1 stop