fix draft team simulation

app.py

@@ -273,21 +273,21 @@ if genre == ':rainbow[Heroes Explorer]':
 ## Program 2 "Team Simulation"
 elif genre == "Team Simulation":
 
-    def choose_hero():
-        name_choice = st.selectbox(label='Hero Name:', options=all_name_extra, index=0)
+    def choose_hero(key="Hero1"):
+        name_choice = st.selectbox(label='Hero Name:', options=all_name_extra, index=0, key=key)
         costume_list = return_costume_list(df_extra, name_choice)
-        costume_choice = st.selectbox(label='Costume:', options=costume_list, index=0)
+        costume_choice = st.selectbox(label='Costume:', options=costume_list, index=0, key=key)
         lb_list = ['None', 'LB1', 'LB2']
-        lb_choice = st.selectbox(label='Limit Break:', options=lb_list, index=0)
+        lb_choice = st.selectbox(label='Limit Break:', options=lb_list, index=0, key=key)
     
         df_ret = return_hero_stat(df_extra, name_choice, lb_choice=lb_choice, costume_choice=costume_choice)
         return df_ret
     
     col1, col2, col3, col4, col5 = st.columns(5)
     with col1:
-        df_hero1 = choose_hero()
+        df_hero1 = choose_hero(key="Hero1") # 'key' in st.selectbox to differentiate widgets
     with col2:
-        df_hero2 = choose_hero()
+        df_hero2 = choose_hero(key="Hero2")
 
     df_hero_all5 = pd.concat([df_hero1, df_hero2])
     display_heroes_from_df(df_hero_all5, display_cols=df_ret.columns[:-2], show_df=False) # display all except special-skill text