Split line not where expected.

In the attached  part, the split line is not where it should be.  The line should be a uniform .5mm from the front plane.  Built the same exact part in NX, and the line is exactly .5mm from the front plane as expected.  Anyone else have problems with split lines?  Any idea why it does this?  The mold parting line that is eventually built from this is all messed up due to this apparent error.

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