After Effects: Vertical Mask Path

Another newbie question regarding After Effects:

I'm creating a kinetic typography project and am playing around with bringing text in from the sides of the screen by first creating a mask and then setting up a path along it with numerous keyframes. I've been able to do this successfully moving text horizontally, but I am having issues when I try to do the same vertically.

In the screenshot below, I am trying to bring the words "sellers sell" from the bottom of the screen up to where they are shown. But when I draw a mask and then try to create a path along it, it rotates the text. I need the text to remain upright the entire time. What am I doing incorrectly? Thank you in advance!

 

Thanks! I don't know if it's just because I'm sleep deprived or what, but I was sure that I had tried to animate position with no luck. Just tried it again and it's exactly what I'm looking for. Thanks again.