Importing AE file into Premiere Pro

To elaborate on Andrew's post: Premiere will always assume all footages have the
same specs as the project settings. For DV/ HDV projects this means it will
think they are interlaced with lower fields. if you didn't render them with
these settings, you will have to tell this Premiere by manually setting the
footage interpretation just as you would in AE. Also check your viewer settings.
Maybe they are just set to draft quality or auto-adjust themselves because you
scaled them oddly and thus the clips are presented at crooked scaling rates.
Another potential cause for this could be a problem with your graphics card, so
if you cannot resolve the matter by the other methods, disable hardware
accelerated playback in the viewer's options (the little arrow in the top right
corner).