Index: Riskeer/Common/src/Riskeer.Common.Forms/Helpers/CalculationsDisplayNameHelper.cs
===================================================================
diff -u -r4ec692ae375eea04cf4e4ee028d719476b20c9bb -rf46c8c7a6ec4924d8e1298fc06ca1d77bcb7e3bb
--- Riskeer/Common/src/Riskeer.Common.Forms/Helpers/CalculationsDisplayNameHelper.cs	(.../CalculationsDisplayNameHelper.cs)	(revision 4ec692ae375eea04cf4e4ee028d719476b20c9bb)
+++ Riskeer/Common/src/Riskeer.Common.Forms/Helpers/CalculationsDisplayNameHelper.cs	(.../CalculationsDisplayNameHelper.cs)	(revision f46c8c7a6ec4924d8e1298fc06ca1d77bcb7e3bb)
@@ -128,21 +128,19 @@
                 IList<KeyValuePair<object, string>> elementsWithSameDisplayNameAsFirstElement = nonUniqueDisplayNameLookup.Where(e => e.Value.Equals(firstElement.Value))
                                                                                                                           .ToList();
 
+                uniqueDisplayNameLookup.Add(firstElement.Key, firstElement.Value);
+                nonUniqueDisplayNameLookup.Remove(firstElement.Key);
+                
                 if (elementsWithSameDisplayNameAsFirstElement.Count > 1)
                 {
-                    for (var i = 0; i < elementsWithSameDisplayNameAsFirstElement.Count; i++)
+                    for (var i = 1; i < elementsWithSameDisplayNameAsFirstElement.Count; i++)
                     {
                         KeyValuePair<object, string> elementWithNonUniqueDisplayName = elementsWithSameDisplayNameAsFirstElement.ElementAt(i);
 
-                        uniqueDisplayNameLookup.Add(elementWithNonUniqueDisplayName.Key, elementWithNonUniqueDisplayName.Value + $" ({i + 1})");
+                        uniqueDisplayNameLookup.Add(elementWithNonUniqueDisplayName.Key, elementWithNonUniqueDisplayName.Value + $" ({i})");
                         nonUniqueDisplayNameLookup.Remove(elementWithNonUniqueDisplayName.Key);
                     }
                 }
-                else
-                {
-                    uniqueDisplayNameLookup.Add(firstElement.Key, firstElement.Value);
-                    nonUniqueDisplayNameLookup.Remove(firstElement.Key);
-                }
             }
 
             return uniqueDisplayNameLookup;