CM, nothing new there. Several years before at a fire power demo one F4 should have salvoed 6x1000lb HE. The other two aircraft dropped but he didn't.
As they didn't want to risk landing with 6 live 1000lb bombs and an unknown reason for a hangup they elected a safe jettison and cleared 3 dummy Sparrow, a strike camera, a SU pod (fully loaded), and 4 training SW.
It was not possible to determine the reason for the failure to drop but . . .
Then of course where the switches were indeed all in the correct positions - splash one Jag.
Or more recently when a Jag dropped all his practice bombs neatly package in the CBLS.
Happened all the time. Of course I never made a switch pigs much.