The bitmap resizes itself depending on how the GIB is setup. Noodle created multiple grid images because the resizing causes some of the points to be inaccurate.
More to point, you'll need to modify the GIB so that it uses relative dimensions instead of absolute dimensions. I've got some time so I'll look into fixing it and edit this post if I have any luck.
Edit: Ran out of time. I'll look at it again when I get back.