Index: Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Service/DuneErosionDataSynchronizationService.cs
===================================================================
diff -u -re57e79927485e44d681b0617f17bada42dbfb862 -rd250742a6f6832dca2d6e343662a2810d6623119
--- Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Service/DuneErosionDataSynchronizationService.cs	(.../DuneErosionDataSynchronizationService.cs)	(revision e57e79927485e44d681b0617f17bada42dbfb862)
+++ Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Service/DuneErosionDataSynchronizationService.cs	(.../DuneErosionDataSynchronizationService.cs)	(revision d250742a6f6832dca2d6e343662a2810d6623119)
@@ -69,6 +69,7 @@
                 throw new ArgumentNullException(nameof(duneLocations));
             }
 
+            failureMechanism.ClearDuneLocationData();
             if (hydraulicBoundaryLocations.Count == 0 || !duneLocations.Any())
             {
                 return;
@@ -94,7 +95,6 @@
                     correspondingDuneLocations.Add(duneLocation);
                 }
             }
-
             failureMechanism.SetDuneLocations(correspondingDuneLocations);
         }