diff --git a/plots.py b/plots.py
index a8d19a0..29e2180 100644
--- a/plots.py
+++ b/plots.py
@@ -253,7 +253,7 @@ class QualtricsPlotsMixin:
         
         return chart.properties(title=title_config)
 
-    def _save_plot(self, chart: alt.Chart, title: str, filename: str | None = None) -> alt.Chart:
+    def _save_plot(self, chart: alt.Chart, title: str, filename: str | None = None, skip_footnote: bool = False) -> alt.Chart:
         """Save chart to PNG file if fig_save_dir is set.
         
         Args:
@@ -261,11 +261,14 @@ class QualtricsPlotsMixin:
             title: Chart title (used for filename if filename not provided)
             filename: Optional explicit filename (without extension). If provided,
                      this is used instead of deriving from title.
+            skip_footnote: If True, skip adding filter footnote (use when footnote
+                          was already added to a sub-chart before vconcat).
         
         Returns the (potentially modified) chart with filter footnote added.
         """
         # Add filter footnote - returns combined chart if filters active
-        chart = self._add_filter_footnote(chart)
+        if not skip_footnote:
+            chart = self._add_filter_footnote(chart)
 
         if hasattr(self, 'fig_save_dir') and self.fig_save_dir:
             path = Path(self.fig_save_dir)
@@ -1382,11 +1385,14 @@ class QualtricsPlotsMixin:
             height=height or 350
         )
         
+        # Add filter footnote to main chart before combining with legend
+        main_chart = self._add_filter_footnote(main_chart)
+        
         # Add custom legend below the chart
         legend = self._create_gender_correlation_legend()
         chart = alt.vconcat(main_chart, legend, spacing=10).resolve_scale(color='independent')
 
-        chart = self._save_plot(chart, title, filename=filename)
+        chart = self._save_plot(chart, title, filename=filename, skip_footnote=True)
         return chart
 
     def plot_speaking_style_ranking_correlation_by_gender(
@@ -1480,11 +1486,14 @@ class QualtricsPlotsMixin:
             height=height or 350
         )
         
+        # Add filter footnote to main chart before combining with legend
+        main_chart = self._add_filter_footnote(main_chart)
+        
         # Add custom legend below the chart
         legend = self._create_gender_correlation_legend()
         chart = alt.vconcat(main_chart, legend, spacing=10).resolve_scale(color='independent')
 
-        chart = self._save_plot(chart, title, filename=filename)
+        chart = self._save_plot(chart, title, filename=filename, skip_footnote=True)
         return chart
 
     def plot_speaking_style_color_correlation(
@@ -1629,11 +1638,14 @@ class QualtricsPlotsMixin:
             height=height or 350
         )
         
+        # Add filter footnote to main chart before combining with legend
+        main_chart = self._add_filter_footnote(main_chart)
+        
         # Add custom legend below the chart
         legend = self._create_gender_correlation_legend()
         chart = alt.vconcat(main_chart, legend, spacing=10).resolve_scale(color='independent')
         
-        chart = self._save_plot(chart, title, filename=filename)
+        chart = self._save_plot(chart, title, filename=filename, skip_footnote=True)
         return chart
 
     def plot_demographic_distribution(