An opportunity is triggering a workflow rule that is set to evaluate. When a record is created,
or when a record is edited and did not previously meet the rule criteria’. The opportunity
previously met the workflow criteria so the workflow rule should not trigger now. But the
workflow rule is being triggered. What could be the reason?

Answer: This can happen when the account that the opportunity is related to is changed. Doing this will re-parent the opportunity and thus all ‘on-create’ workflow rules will trigger.