Saving per channel brightness/contrast setting

I saw a post about this somewhere but can’t find it now for the life of me.

My per channel brightness/contrast settings seem to be changing randomly. I am aware of the “Default for all media” option.

Example:
1 – Switch to channel 5, change brightness to 54 (it DOES in fact make the video brighter.)
2 – Switch to channel 2, check settings and brightness is set to 50 (default) automatically.
3 – Switch back to channel 5. Brightness is back to 50 again (or maybe whatever ch 2 was set to. or maybe back to 54 again.)

In other words it’s very random and I can’t get it to reproduce in any consistent way.

Am I mistaken in thinking that brightness/contrast is saved “per channel?”

If it is per channel it seems like the channel change script is not pushing or pulling the settings to the database correctly.