Trackpad unresponsive on half of trackpad

I recently replaced the keyboard, battery and trackpad on a macbook pro 15" mid-2009 unibody. The keyboard and battery work fine, but I am finding issues with the track pad.

The trackpad is able to click, but it is unresponsive to mouse movement in the upper half of the trackpad. I can only move it left and right if I use the upper half of the trackpad. I am able move the cursor in any direction on the lower half.

I have tried adjusting the main clicker screw, but I don't belief that to be the issue because it's able to click anywhere on the trackpad just fine.

The mounting screws are tight in their place.

I think I received a bad part, but I want to explore all the options before returning the part.