Did you do an Edit Capture Time to change the capture times of the photos at some point? If so, see this thread for a workaround: Lightroom CC: mind adjusted photo capture time when creating panoramas (and possibly hdrs too)
Thanks, that is probably the issue. The photos were taken in Mountain
time and I live in Pacific. These were taken 5 years ago so I do not
remember if I had to adjust the time, but I often do when I travel.