Fix calculation issue for #9346

Closes #9346

freqtrade/persistence/trade_model.py

@@ -1053,7 +1053,7 @@ class LocalTrade:
                 price = avg_price if is_exit else tmp_price
                 current_stake += price * tmp_amount * side
 
-                if current_amount > ZERO:
+                if current_amount > ZERO and not is_exit:
                     avg_price = current_stake / current_amount
 
             if is_exit:

tests/persistence/test_persistence.py

@@ -2392,9 +2392,8 @@ def test_recalc_trade_from_orders_kucoin():
     trade.update_trade(order3)
     # assert trade.amount == o1_amount + o2_amount
     assert trade.is_open is False
-    # The below values are wrong.
     assert trade.amount == 8e-09
-    assert trade.close_profit_abs == -8270.49735089
+    assert trade.close_profit_abs == 3.90069871
 
 
 @pytest.mark.parametrize('is_short', [True, False])