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Such "automatic copy" effects have three causes that I know of:
- If the field is the key field used in the relationship on which the portal is based and "allow creation of records via this relationship is enabled" then filemaker automatically copies the matching value from the parent record when the new portal record is created by entering data in a field in the portal.
- In the field options for a given field, an auto-enter feature can be enabled that uses either "looked up value" or a calculation to automatically enter data into the field. Find the field's definition and check its field options to check this out.
- The field could be a calculation field that is pulling data from other fields and/or tables. Check the field's definitions to see.