diff --git a/IRaCIS.Core.Application/Service/Allocation/VisitTaskService.cs b/IRaCIS.Core.Application/Service/Allocation/VisitTaskService.cs
index d6db539f5..e2538ee6e 100644
--- a/IRaCIS.Core.Application/Service/Allocation/VisitTaskService.cs
+++ b/IRaCIS.Core.Application/Service/Allocation/VisitTaskService.cs
@@ -2976,7 +2976,9 @@ public class VisitTaskService(IRepository<VisitTask> _visitTaskRepository,
             {
                 int randomIndex = rng.Next(availableNumbers.Count);
 
-                var order = 11 + 5 * (randomIndex - 1);
+                var num = availableNumbers[randomIndex];
+
+                var order = 11 + 5 * (num - 1);
 
                 await _visitTaskRepository.BatchUpdateNoTrackingAsync(t => t.Id == id, t => new VisitTask() { RandomOrder = order });