Person Sees Lips Move Then Hears What Person Says Few Seconds Later

I know someone who had lot of earwax and it affected hearing.

Family Doctor prescribed Ear Drops

After taking ear drops hearing became worse. Sometimes can hear very light, some not at all.

Two weeks after taking ear drops, person can now hear much better but still has times when hearing is poor.

one strange thing

when the person starting hearing well, when watching YouTube in streaming device, (ie Crime Patrol on YouTube, courtesy of Roku) the person sees the lips move snd few seconds later will hear what the person said

wha?

but if person is watching regular cable tv, like CNN, person can mime hear what is said

this never happened before.

Dr Google isn’t giving any clues or hints.

Any experiences?