There's a setting on many newer tv's that equalizes the volume between channels and on the same channel (they DO program commercials to be louder on many channels). It seems likely, if your LR tv is a newer one, that you have that enabled and it's filtering your selections.
Trying to look up what that control is called. It's in your audio menu if you have it. I'm away from the tv I have that does it, but will edit if I find the info.
Edit: AVL or Automatic Volume Leveling ON will equalize volumes between channels and on the same channel. It is modulated when received and then broadcast to you. Turn it OFF to receive unmoderated volumes.
Note : this from Google. I'm not sure that's the only name for this setting, as I think mine called it something else, but it will be this or something similarly vague in your audio settings.
In any case, I think it's the tv, nor the station or provider, that's giving you variable experiences.
"If the house lost every hand, they wouldn't deal the game."