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No sound in some website videos + Confused about Drivers

Only recently videos played in some websites produce no sound output. But some others are perfectly OK.
It's the same in Firefox and Vivaldi. System sounds and WMP are all OK.

I wondered if a driver needed updating but I am totally confused by the following.
In Realtek HD Audio Manager the driver version is
In Device Manager/Audio/Speakers the driver is 6.3.9600.16384 and driver details say no files required or loaded?????
In Device Manager/Sound, video and game controllers/Realtek the driver is and driver details lists 75 files !!!!

Can anyone advise a way forward to solve my no sound ? Thank you.

My Computer

System One

  • OS
    Windows 8.1 64-bit
    Computer type
    System Manufacturer/Model Number
    ASUS X751L
    KIS 2019