The difference is two hours - C-SPAN 5pm ET vs Campaign 6pm CT (7pm ET).
I think the campaign rescheduled to later, on short notice. It takes some time for that that change to propagate through reporting outlets.
I thought maybe there was an unscheduled meeting (meaning not on the campaign website, scheduled in fact, just not a public schedule) that was going to be covered, like his meeting with business leaders in Florida, or one of his Ohio rallies last week, but the evidence points to a simple reschedule.
Thanks very much for the explanation.
Hope CSPAN still carries it.
RSBN tweets are saying the original 4 pm CT.