Corner Pin has Random Distortion Mid-Animation

[Gabalish]

Hello there!

I'm going to have rows of type sweep across the screen in a one-point perspective (like in a military parade), and for some reason, midway through this curve distortion appears for about 10 frames. The stop watches you see are the only ones in use (and corner pin is the only effect in use). 

Is this a glitch? Or is there a way to fix this?

p.s. I'm a student that recently learned how to use after effects, so I may need a little more details. I'm using the latest version of After Effects CC

[Rick Gerard]

I think it would be more efficient to make the Text layer 3D and add a camera. Perspective is controlled by camera position and framing by focal length (Zoom in the camera properties (aa reveals)). If you just want to have the text layer move across the screen with the same perspective, then Corner Pin to set the angle and position keyframes to move the layer from right to left would do the trick with just a 2D layer. 

It would really help us help you if we knew what the design goal was. Please describe the finished shot in detail, and we can probably help you achieve the results you want.