Are materials always reflective?

Development Rendering
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1

I would like to have my material without any reflection, so I set metallic and specular to 0 and roughness to 1. But I still get visible reflection going on:

http://i.imgur.com/4uGx5oz.gif

Is this a glitch or is it not possible to make materials without any specular/metallic reflection in UE4?

2

If anyone bumps into this here, here is a fix: Material rendering bug in 4.8 - Rendering - Unreal Engine Forums