Supervised and unsupervised classification, Sentinel 2

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Hi!
I did supervised classification also. To explain what I did, I write down step by step because something went wrong and the result were not what I expected:

  1. resampling image
  2. subseting image
  3. defining geometries
  4. saving
  5. reprojecting
  6. supervised classification ( KNN-classifier, took 4 hours)
    and result

image.png1407×906 52.4 KB

Almost the same (even worse) happened when I tried unsupervised classification ( K-means ):

image.png1766×911 62.1 KB

Any ideas what I did wrong?