Hello Kay,
You and I discussed this on the phone, but I wanted to post a reply here for the benefit of others.
Based on your description, it appears as if you have a Defect workflow step or template which is changing those fields when the Incident is being copied to a Defect. Check the Step Actions tab under each of your workflow steps to make sure you're not inadvertently changing those values.
Let me know if you have any further questions.
Thank you,
Tom Harder
Axosoft Support
support@axosoft.com1.800.653.0024 option 3--'Fear the Bug' Podcast--