Use pos_str as display with key arg for uniqueness

src/pages/10_Set_Your_Lineup.py

@@ -92,10 +92,11 @@ def position_cell(week: str, pos_str: str, options_list: list[PlayerOption], exi
         options = options_list
 
     selected_player_from_box = st.selectbox(
-        pos_label,
+        pos_str,
         options=options,
         format_func=format_player_option,
         index=selected_option_idx,
+        key=pos_label,
     )
     if selected_player_from_box and int(week) == CURRENT_PLAYOFF_WEEK:
         if selected_player_from_box.gsis_id and selected_player_from_box.gsis_id != selected_id: