Weird static-y appearance of object I'm working on some motion graphics that involves making text appear from behind objects and other text. 

I was able to get the first word appear correctly using empties, texture mapping, and mix shaders. (I've been following this tutorial.)

However, when I attempted to use the same method, the second word ends up looking like this: 



Does anyone know why this is/how I could fix it? I want the second word (Tech) to disappear/appear behind the first word (VES in the screenshot).

Materials:


Background surface is a plane set to Emission, Strength 2.0
First word (VES in the screenshot): Text object, node setup:

Second word (Tech in the screenshot, static-y): Text object, node setup:
Both text objects are located at exactly the same y-coordinate (0). To fix this move one of the text objects slightly along the y-axis after that the z-fighting artifacts will disappear.