diff --git a/ViewModel/Grading/GradingResultVM.cs b/ViewModel/Grading/GradingResultVM.cs
index a0aff48..aeeb71a 100644
--- a/ViewModel/Grading/GradingResultVM.cs
+++ b/ViewModel/Grading/GradingResultVM.cs
@@ -1619,7 +1619,7 @@ public class GradingResultVM : BaseViewModel
     [Log]
     public void ChangeSym(object norm)
     {
-        decimal? order = this.DtResults.Select(x => x.SymLevel).Max();
+        decimal? order = this.DtResults.Where(x => x.TestItemId != "TWIST").Select(x => x.SymLevel).Max();
         if (order.HasValue)
         {
             totalSymGrade = order.Value;