Subdivided Meshes have an unsubdivided 'Ghost' around them... why?

Hey, everyone. So, I constructed a blocky cave model in modo, subdivided it a few times to smooth out the cave walls, and saved and exported it as an obj. I then brought it into Unity only to find some 'ghost' unsubdivided geometry around it. What am i doing wrong?



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nm... i fixed it. ;D i had an invisible mesh layer still enabled in my 3d program that was getting rendered in unity.