Freeradius as a secondary

I am using Freeradius as a Secondary Radius. The issue is sometimes not always but 98% of the time A user when they connect to the secondary (freeradius) and connect accounting packet start and then when they disconnect no accounting packet stop gets to the secondary Reason its going to the primary radius (VOPRAdius) Thus the problem being the secondary thinks they are still connected. The nas's are not onn site these are from level3 networks Does anyone know what to do for this? Since freeradius is not being used as a primary too I am at a stump on this one.