Reset index of combined dataframe in app.py to ensure proper data alignment after concatenation of contest and portfolio data.

app.py

@@ -213,6 +213,7 @@ with tab1:
                 st.write('Portfolio data:')
                 st.dataframe(st.session_state['portfolio_df'].head(25))
                 st.session_state['combined_df'] = pd.concat([st.session_state['Contest'], st.session_state['portfolio_df']], ignore_index=True)
+                st.session_state['combined_df'] = st.session_state['combined_df'].reset_index(drop=True)
                 st.session_state['entry_list'].append('Backtesting_upload')
             else:
                 pass