diff --git a/ProjectPage/OptionPanel/MachiningOptionPanel/SimulationExpander/SimulationExpanderViewModel.vb b/ProjectPage/OptionPanel/MachiningOptionPanel/SimulationExpander/SimulationExpanderViewModel.vb
index 2ad6828..a23456f 100644
--- a/ProjectPage/OptionPanel/MachiningOptionPanel/SimulationExpander/SimulationExpanderViewModel.vb
+++ b/ProjectPage/OptionPanel/MachiningOptionPanel/SimulationExpander/SimulationExpanderViewModel.vb
@@ -120,7 +120,7 @@ Namespace EgtCAM5
             Return m_L3Value
          End Get
          Set(value As String)
-            If value <> m_L2Value Then
+            If value <> m_L3Value Then
                m_L3Value = value
                OnPropertyChanged("L3Value")
             End If
@@ -146,7 +146,7 @@ Namespace EgtCAM5
             Return m_R1Value
          End Get
          Set(value As String)
-            If value <> m_L2Value Then
+            If value <> m_R1Value Then
                m_R1Value = value
                OnPropertyChanged("R1Value")
             End If
@@ -172,7 +172,7 @@ Namespace EgtCAM5
             Return m_R2Value
          End Get
          Set(value As String)
-            If value <> m_L2Value Then
+            If value <> m_R2Value Then
                m_R2Value = value
                OnPropertyChanged("R2Value")
             End If