Shape Masks move after exporting

Hi guys,

I've been trying to make a video and I've applied some shape masks to some words. The masks are key-framed to move so only certain words come up at a time.
The video works great and is exactly how I want it within FCPX but as soon as I export the video, the masks seem to change size and move.
The words are cut up and glitch, the masks cover up half of the words.

I've the export on 2 different Mac's and I'm having the same problem.

Here are the specs for my work computer:
iMac, Late 2013
Processor: 2.7 Ghz Intel Core i5
Memory: 8GB 1600 MHz DDR3
Graphics: Intel Iris Pro 1536 MB

I'm using Final Cut Pro 10.2.1.