Update app.py

app.py

@@ -101,7 +101,8 @@ with tab1:
 
         ascending_headers = sorted(mutation_site_headers_actual)
         df_sorted = df[[str(h) for h in ascending_headers if str(h) in df.columns]]
-
+        df_sorted = df[[str(h) for h in ascending_headers if str(h) in df.columns]].copy()
+        
         # Insert fake column for 3614 with all 0s, in the correct position
         insertion_index = df_sorted.columns.get_loc("3562") + 1  # insert after 3562
         df_sorted.insert(insertion_index, "3614", 0)