qListView will display different result on Approval Workflow field if the permission granted to the user to view the site is different.
For example, when setting up qListView to display the Approval Status, if a user have full right on the site, the Approval status will display correctly (eg. display as Approved, Pending or etc). But if a user with only Read permission assigned to that site, the Approval Status will display as number (eg. 1, 2 or 3).