- What version of Dolphin are you using? I recommend using the latest beta/development version of Dolphin. Download it from here.
- Are you using NKit ISO format? If yes, then avoid using NKit ISO, and use either WBFS/ISO.
- Also try changing your graphics backend to OpenGL or Direct3D or Vulkan.
If all this doesn’t help, then open Dolphin > Right click on the icon of the game in games list > Properties > Verify > Verify Integrity
And then post the screenshot of the result here.
It might be a bad dump.