Video Tech Explained has a video about HDR formats https://youtu.be/Q_-qNvP4DW0
My guess would be that some DolbyVision content uses unrealistically high values for highlights from that 10 000 nit dynamic allowed when OLED tvs have maximum around 600 and back lit have a maximum around 1000 and that results eveything else being tone mapped really dim. Nothing much you can do if the content is mastered in a way it doesn't work well on consumer displays.
There's another video about HDR in general https://youtu.be/aJE1C9enYNc
Three days without defecating, no explanation