Zinc `Generate Decoys`

I am trying to generate decoys for the following molecule: ZINC49793519. It has one chiral centre, specified as S. For every acctive molecule, ZINC decoy maker should generate 33 decoys. When i attempt it for the following molecule, i end up with 66 decoys. I am just wondering why this is and if its something to do with the chiral centre, but shouldn’t it only consider the S?