Seeing quantities on "ghost" sales orders after Make to Stock Closing Entry

We are seeing a very strange thing happening in regard to our Manufacturing module.  W/T Templates are being set up correct, in regard to scaling, but when we are completing our Make to Stock Closing entry, we are ending up with inventory showing quantities committed to Sales Orders that don't exist.  It has happened for both the part that should be consumed, as well as the part being built, seemingly with no rhyme or reason.  The issue has been resolved by utilization of the Rebuild Sort Files function for Sales Order and Inventory modules.  Just really at a loss for why the issue is popping up at all.

Any input is greatly appreciated.  Thanks!