Nikon d3100 Video Problems?

Hi, I have a Nikon d3100 that I recently got. I do not know much about cameras but when I make videos on it, there's seem to be a problem when I upload the video to my computer. On the video itself, it seems like it is kind of changing colors subtly, like a slight tint of different colors. This doesn't happen if I watch the clip on the camera itself, only when I upload it. I'm attaching a link to one of my videos I made after I posted it on YouTube.(Please don't make fun, it's just a stupid English project I had to do
lol) Thanks!

Looks to me like you're videoing mostly in Auto, including Auto White Balance. One thing you might try is to see what the metering mode you're in. Also go to page 79 of your manual and check out Autoexposure Lock.

BTW, it looks like you and your buddies were having a lot of fun.