Parent assembly scheduling to start before child is scheduled to fin

All,

We're on 9.05.702

We've got some jobs that are scheduling parent assemblies to start before their child assemblies are finished.  Is anyone aware of a field or setting that would cause this?  Parts are not setup as Phantom BOM's.  Operations on both Asm levels are all finish-to-start, with no send ahead offsets. 

Thanks in advance,

Derek