P6 Actuals populated as default

This issue only impacts activities where no actual hours have been uploaded.

When an activity is marked complete and no actuals have been uploaded, P6 will sometimes add the planned hours as actual hours.  But not always.

Auto Complete is not checked.  I upload hours from timesheets.

In the same protect (same settings) another activity can be marked complete and it will not add the planned hours as actuals. It leaves it at zero.

I cant figure out why the discrepancy.

Any suggestion are greatly appreciated.