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Here is a simple particle system hitting a plane with the collision on and also with a high stickiness.

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The objects marked with red have already landed and still have motion blur. The orange has just landed.

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For comparison motion blur vs turned off:

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How can I fix this?

Edited:

If this is really a bug, as commented on @Yann Masoch's answer, is there a workaround? probably converting the particles to rigid bodies, a mesh, a compositing trick, etc.

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In your case, you will have better results with the following Motion Blur settings:

  1. Position: End on Frame
  2. Shutter curve: 1st curve or 3rd curve (sharpest image)

enter image description here

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Just play with the Position and the Shutter curve to adjust the Motion Blur effect.

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    $\begingroup$ Thank you. I will play with the settings. $\endgroup$
    – Rafael
    Commented Oct 15, 2018 at 21:34
  • $\begingroup$ It is better but still shows the blur. It feels like a bug on the particle system. I will leave the question unsolved for now to see if there is another walkarround. $\endgroup$
    – Rafael
    Commented Oct 15, 2018 at 23:23
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    $\begingroup$ I did a lot of tests and the issue is coming from the particles but I have different and non consistent results between Cycle Render and Blender Render. I will investigate that later! $\endgroup$
    – Yann Masoch
    Commented Oct 16, 2018 at 0:07
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    $\begingroup$ I think I figured out the issue... it took me a while! Every time you change the Motion Blur settings, you have to restart the simulation from the beginning in order to have a correct render. $\endgroup$
    – Yann Masoch
    Commented Oct 16, 2018 at 2:22
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    $\begingroup$ Good. Keep us posted when you have a solution! $\endgroup$
    – Yann Masoch
    Commented Oct 16, 2018 at 3:12

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