Why will the sound from some videos no play on my laptop computer's headphones but for most videos it will?

My headphones work and they are not USB headphones. The headphones plug straight into the headphone jack on the computer.

The weirdest part about it is I'll be on the same webpage and one video won't have any sound at all on the headphones and it is like the video is forcing sound through the laptops internal speakers because the internal speakers can get sound, but the headphones can't.

Often, the very next video that comes up on the very same web page I'll get sound from the headphones like I should and the internal speakers are silent like they should be because the headphones are plugged in.

I've noticed that when the problem videos arise where I can't get sound on my headphones, if I click on the speaker icon on the taskbar, two sound volume controls come up instead of just one. For the videos where I can get sound for my headphones just one sound volume control comes up.

When the two volume controls come up, it looks like one is for the laptop's internal speakers because it shows the level of sound going up and down as the person talks for example. The second volume control (likely for the headphones) shows no sound coming through it at all.

Try what I might, I can't get it to push sound through the headphones for those videos. I've tried working with the mixer to no avail.

For example, this video I can't get the sound to come through the headphones.

https://www.yahoo.com/sports/ric-flair-faces-music...