That shouldn’t be a problem. The only time I’ve seen something like that happen, is if there’s a lot of alpha to the object and some parts may be too thin for After Effects to recognize that they are contiguous. After Effects tries to guess a mask around objects when using the puppet tool, sometimes you have to help it along by adding your own mask. If I recall correctly, this only matters when moving the pins themselves, not changing the position property.
This only seems to happen with certain images, as I can’t recreate it right now. How are you trying to move it? You might be able to get away with a transform effect after the puppet effect.
Having it do the same thing while precomped is definitely strange. Do you have continuous rasterization checked?
Joe Clay
Animator
gra-phix.com