A shading bug in polyworks

[-Zombie-]

So this is what happens, lets say i shade an island in polyworks, then i copy the island and save my work, the shading on the copied island is stuffed up. can someone tell me why this is happening? it would save me a heap of time making ctf maps.

added a pic of the copied island

[As de Espada]

this must be something related to the light engine (still bugs a little) of polyworks