Update page_files/Categorized_Search.py

page_files/Categorized_Search.py

@@ -734,13 +734,21 @@ with right_col:
             ]
 
             if not checked_rows.empty:
-                chosen = checked_rows.iloc[-1]  
+                current_abbr = st.session_state.selected_row[0] if st.session_state.selected_row else None
+    
+    
+                new_rows = checked_rows[checked_rows["Abbreviation"] != current_abbr]
+    
+                if not new_rows.empty:
+                    # A new row was checked — use it
+                    chosen = new_rows.iloc[0]
+                else:
+                    # Same row re-checked
+                    chosen = checked_rows.iloc[0]
+                
                 abbr = chosen["Abbreviation"]
                 name = chosen["Material Name"]
-                if (
-                    st.session_state.selected_row is None
-                    or st.session_state.selected_row[0] != abbr
-                ):
+                if st.session_state.selected_row is None or st.session_state.selected_row[0] != abbr:
                     st.session_state.selected_row = (abbr, name)
                     st.rerun()
             else: