Vertex color shade getting darker instead of setting with Shift-K

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1

to replicate:

  1. vertex paint mode.
  2. face selection on.
  3. select two faces of default cube.
  4. paint them any color.
  5. hold s select same color while faces are selected.
  6. shift-K
  7. hold s select same color while faces are still selected.
  8. shift-K

repeat. the faces continually get darker. it doesn’t replace the color that is selected but instead adds to it. why is this happening? i’ve tried messing around with the brush settings, but i can’t seem to set up a proper fill.