Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculatorFirstSlopeAdaptionThenShoulderAdaption.cs
===================================================================
diff -u -r4540 -r5464
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculatorFirstSlopeAdaptionThenShoulderAdaption.cs	(.../DesignCalculatorFirstSlopeAdaptionThenShoulderAdaption.cs)	(revision 4540)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculatorFirstSlopeAdaptionThenShoulderAdaption.cs	(.../DesignCalculatorFirstSlopeAdaptionThenShoulderAdaption.cs)	(revision 5464)
@@ -116,8 +116,11 @@
                 }
 
                 // Design for slope adaption
+                var orgSoilProfile2D = damKernelInput.SubSoilScenario.SoilProfile2D.Clone();
                 while (isRedesignRequired && (coTangent < endCoTangent))
                 {
+                    // Always start with the original soil profile
+                    damKernelInput.SubSoilScenario.SoilProfile2D = orgSoilProfile2D;
                     iterationIndex++;
                     DesignCalculatorUtils.ThrowWhenMaxIterationsExceeded(iterationIndex, maxRedesignIterations);
 
@@ -149,6 +152,8 @@
                 // Then shoulder adaption
                 while (isRedesignRequired && surfaceLine != null)
                 {
+                    // Always start with the original soil profile
+                    damKernelInput.SubSoilScenario.SoilProfile2D = orgSoilProfile2D;
                     iterationIndex++;
                     DesignCalculatorUtils.ThrowWhenMaxIterationsExceeded(iterationIndex, maxRedesignIterations);
 
Index: DamEngine/trunk/src/Deltares.DamEngine.IntegrationTests/IntegrationTests/MacroStabilityInwardsTests.cs
===================================================================
diff -u -r5460 -r5464
--- DamEngine/trunk/src/Deltares.DamEngine.IntegrationTests/IntegrationTests/MacroStabilityInwardsTests.cs	(.../MacroStabilityInwardsTests.cs)	(revision 5460)
+++ DamEngine/trunk/src/Deltares.DamEngine.IntegrationTests/IntegrationTests/MacroStabilityInwardsTests.cs	(.../MacroStabilityInwardsTests.cs)	(revision 5464)
@@ -486,7 +486,7 @@
         Assert.That(output.Results.CalculationResults.First().StabilityDesignResults.SafetyFactor, Is.EqualTo(1.366).Within(tolerance));
     }
 
-    [TestCase("SlopeAdaptionBeforeShoulderAdaption", 1.4, 1.511, 5)]
+    [TestCase("SlopeAdaptionBeforeShoulderAdaption", 1.4, 1.539, 5)]
     [TestCase("OptimizedSlopeAndShoulderAdaption", 1.4, 1.426, 3)]
     public void GivenTutorialDesignDwp1_WhenRunWithGeometryAdaption_ThenGivesExpectedResults(string designMethod,
         double requiredSafetyFactor, double actualSafetyFactor, int iterationCount)