illustrator - fill pattern does not translate with bounding box

I have an EPS file of an imshow() plot that I generated from MATLAB using http://ift.tt/1GXnYUF

I didn't have this problem before, but now when I open the heatmap plot in illustrator and attempt to move the plot around, the colors shift around as if it got somehow tiled and is not translating with the rest of the bounding box.

Any ideas?