They're probably not quite bedded in yet or maybe there is a tiny bit of grease left on one side.... maybe from a fingerprint??
The other thing it could be is the disc not perfectly mated on to the hub face
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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