Couple of things for you to check.
i) Does the data look good in the txt file? That’s to say, is it displaying a keyframe for every frame?
ii) Does your framerate match between the tracking data and your After Effects comp?
If both of those are OK, then you should just restart After Effects and repaste the data in. Any time there’s a problem with pasting stuff into AE, a restart is a good cure-all.
Hope that helps,
Ben
Curious Turtle Professional Video
Training | Editing |Support
http://www.curiousturtle.com
Just out: Rock Steady : Successful Motion Tracking in Mocha & After Effects