Answered
In my calculation order dialog box, among the many field names displayed I have one field which shows 4 times. I've checked to see if the field was inadvertently duplicated 3 times, but it is not.
This is not causing any apparent problem. I've watched this for a couple of weeks, thinking perhaps it would correct itself, but it has not.
Is this a sign of something that needs to be corrected, or unheard of?