Wrong letter template going out even though correct one selected

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Help - this keeps happening!   I have modified the New Employee Notification letter to include the verbiage we'd like for our company.  Have added a logo, etc.  Our modified New Employee Notification letter is the one selected on the System Templates page as the letter to be sent on event: Auto Email to new Employee.   It was correctly sent out while testing the past few weeks.  But a couple times lately, the old/original template has gone out instead.  And that template doesn't really even exist any more; rather, the template exists but I've changed all the wording in it --