Overexposure – With the Canon Eos M3, overexposed images are created in any mode except automatically

I recently bought a Canon EOS M3 and experiment with different modes. Any image taken with anything other than the automatic mode, especially SCN, is overexposed. Really bright white, but not blurry. Probably a beginner mistake, but how can I fix it? I already reset the camera settings, but it did not work.