Light Shadow issues

I have a problem within a pitch black scene.
As you can see on the picture a simple spot light effecting a simple floor with the default texture.
In the scene i have 2 plates and as you can see the shadow on the left edge of the front plate should not be there.
It should be a simple, perfect circle of light without this shadow fragment on the left side.
I’ve played with a lot of options (Use Inverse Squared Falloff, angles, intensity, radius, …) but a can’t get rid of this lighting issue.
This happens also with a Point Light.

Any ideas why this happen or how i can fix this?

Found the problem. I’ve exported my mesh from blender with “edge smoothing” instead of “face smoothing”.
That fixed my problem.