Render shows weird shadow line along Y-axis

[aklyuchnikova5MJMA]

I started having this issue with my point lights seemingly being split in two for some reason and perfectly down the y-axis. There is no other geometry in or around the lights to interfere with the lighting render and the shadow cast upon a simple surface. I've tried moving the lights around, rotating them, and they still cast the same shadow. I've tried enabling/disabling the shadows, environment and sun status. Has anyone else experienced this issue? And how can I fix it?

Pictured: two point lights of different intensities casting the same weird shadow line

 

[ChrisRS]

I may be exposing my ignorance, but us this in Civil 3D?

If so, where and more detail would help.

If not, you will get more hep in an appropriate forum.