Barriers on the left and right side of my project.

Hey guys, I am a pretty experienced user of Sony Vegas, but I have just recently come across a glitch or something that I am missing, because When I go to do Picture in Picture, by using the event pan/crop tool, during placement, there are barriers on the left and right side of the screen that make the video just disappear further beyond said barrier. If you guys have any suggestions on how to fix this it would be much appreciated!

Thanks,
Matt