I had always thought, at least in my case, that my green and blue cones are normal, but my red just don’t work well. For example, if you just drop the R values in RGB in a picture to zero, I won’t generally notice. I would assume I’d perceive it somehow being different if my sensitivity shifted.
There are different forms of color blindness. I have Deuteronopia, which is an abnormal green perception. It sounds like you may have Protanopia, which is an abnormal red perception. Protanopes may have limited ability or an inability to see red. Signs you may have protanopia include seeing black instead of shades of red, seeing dark brown as dark green/orange/red/blue/purple/black, seeing some blues instead of reds, purples and dark pinks, and seeing mid-greens instead of some oranges
