Visual Bug with Emissive Material

I’m having an issue using emissive materials in an unlit scene, as seen in this video:

I am using simple C++ commands to achieve this, taking the touch input from Touch1, recording the X and Y axis, calculating a rotational velocity, and then rotating the camera about the cube.

I’m not sure if this has anything to do with my camera setup - it’s just a simple camera attached to a spring arm.
Any ideas?

I dont see any problems. What is wrong with it?

It turns out I had motion blur on. D’oh.
The issue was with the “phantom” image that was emitting from the cube.