Broadcast audio has all kinds of things that can cause that type of glitch.
It's probably the satellite up-link (streaming audio/video data packs) having sync problems.
I've done a good bit of television broadcast work (and I have a lot of friends in that industry) and it's fast, hard work that's prone to problems. You have a ton of redundancy, but sometimes it all goes to hell.
stressful work when it's a live broadcast. You wouldn't believe how chaotic and noisy the audio room is. Producers yelling in your ear through the monitors, trying to cue the next audio feed etc. You get paid pretty well but man is it taxing!
Those pops can be really
nasty through a nice HT sound system!
The nightly news is a live (with a small delay) feed.
Back in the day of the big satellite dishes you could watch the network feeds of news broadcasts, and when they would go to commercial, you would see the anchors messing with their hair, picking their nose, etc.
Must see tv!