diff --git a/ApplicationLibCode/ProjectDataModel/RimEclipseCase.cpp b/ApplicationLibCode/ProjectDataModel/RimEclipseCase.cpp
index d9b03e6..c98cc5d 100644
--- a/ApplicationLibCode/ProjectDataModel/RimEclipseCase.cpp
+++ b/ApplicationLibCode/ProjectDataModel/RimEclipseCase.cpp
@@ -845,11 +845,13 @@ RimDataFilterCollection* RimEclipseCase::dataFilterCollection() const
 std::vector<QString> RimEclipseCase::additionalFiles() const
 {
     std::vector<QString> additionalFiles;
+    std::set<QString>    seenFiles;
     for ( const RimEclipseInputProperty* inputProperty : m_inputPropertyCollection()->items() )
     {
         if ( inputProperty->fileName == gridFileName() ) continue;
 
-        additionalFiles.push_back( inputProperty->fileName().path() );
+        const QString fileName = inputProperty->fileName().path();
+        if ( seenFiles.insert( fileName ).second ) additionalFiles.push_back( fileName );
     }
 
     return additionalFiles;
diff --git a/ApplicationLibCode/ProjectDataModel/RimEclipseResultCase.cpp b/ApplicationLibCode/ProjectDataModel/RimEclipseResultCase.cpp
index 8c7c10d..642c818 100644
--- a/ApplicationLibCode/ProjectDataModel/RimEclipseResultCase.cpp
+++ b/ApplicationLibCode/ProjectDataModel/RimEclipseResultCase.cpp
@@ -311,7 +311,6 @@ bool RimEclipseResultCase::importGridAndResultMetaData( bool showTimeStepFilter
         else
         {
             computeCachedData();
-            loadAndSynchronizeInputProperties( false );
         }
 
         m_gridAndWellDataIsReadFromFile = true;
@@ -337,6 +336,9 @@ bool RimEclipseResultCase::importGridAndResultMetaData( bool showTimeStepFilter
 
         results( RiaDefines::PorosityModelType::MATRIX_MODEL )->computeCellVolumes();
 
+        // Create derived results first so input property names stay stable after reopening.
+        if ( !hasNestedHybridSidecars ) loadAndSynchronizeInputProperties( false );
+
         // Nested hybrid grid: pre-compute the coarse aggregate of the key QC results.
         computeNestedHybridCoarseAggregatesIfPresent();
     }