Weird front sprocket wear?

Hey guys - I just recently changed my chain and sprockets but started getting a whining / wirring noise. I thought at first I may have had the chain too tight so I loosened it up but still this noise was there. So I changed to the old front sprocket and the noise was gone.

Here are some pics of the "new" sprocket:





Really weird looking witness marks on the inside of the teeth.

Full background: I swapped this 16 tooth sprocket in for a few hundred km's before I changed the chain and rear sprocket (to try it out to see if I liked it). So, the front sprocket was run for a short time with the old chain (I'm talking 200KM max). The old 17 tooth front had some slight wear on it (at the rear of the teeth like from acceleration) so I swapped it around. It's totally quiet. The old chain and sprockets were not at all noisy - just the chain was stretched as you could pull it away from the rear sprocket. Bike has 30KM on it.

Ideas? Is this somehow the wrong size sprocket? Or is it cut incorrectly? I can't imagine a few hundred KM's run on the old chain ruining this sprocket? It's an RK 52516-C5041 which is a 16 tooth 525 sprocket. Chain is a DID 525ZVM-X so not a cheap one by any means.

Thoughts??