Some fields are mapped to the source interface by default. You can quickly do a group unmap of fields in Customize Interface.
This example unmaps the Line Item fields. the Carrier Email Notification fields.
to unmap a group of fields
Right-click on the group and select Clear Mappings.
to unmap a single field
Select the field and right-click on it. Select Clear
Mappings.
Right-click the field or group and select revert to default or restore saved mappings from the menu.
Reverting will bring back the original default mappings installed for your interface. Restoring will reimpose all the defaults and any customizations you made.