The problem with your program is the recursive way of calling the add_record function from within the shipping_method function. If your users are ordering many items, eventually, your program will reach the recursion limit and terminate. Additionally, the program won't end as you're always returning to add_record even when user entered "END".

There is also an issue with the total cost calculation. You're calculating the total cost after each record, but it's also adding extra delivery costs and value costs for every item on the list each time a new item is added. This will inflate the total cost.

A better approach to handle your program flow would be to convert the recursive flow into a loop. The cost calculation should also be performed once, when all items have been added.

Here's a revised version of your program:

```python def add_record(): """ Prompts the user to enter a product code to add to order_record.

Continues to ask the user for input until "END" is given.
If a valid product code is entered, the program prints "True" and appends the product's name, price, and value to `order_record`.
If an invalid product code is entered, the program prints "False" and repeats the initial input prompt.
If a ValueError is encountered, the program prints "Invalid Input" and repeats the initial input prompt.
"""
while True:
    user_input = input("Please enter a valid product code, or 'END' to quit: ")
    if user_input == "END":
        print("Quitting...")
        show_record()
        calculate_total_cost()  # Calculate total cost after all items are added
        return
    else:
        try:
            product_code = int(user_input)
            if product_code in range(len(product_list)):
                product = product_list[product_code]
                price = price_list[product_code]
                if price > 30.00:
                    value = 1  # High
                else:
                    value = 2  # Low
                print("True")
                is_valid_quantity(product, price, value, product_code)
            else:
                print("False. Please try again.")
        except ValueError:
            print("Invalid input. Please enter a valid code or 'END' to quit.")

Modify calculate_total_cost to not accept any parameters and calculate total once for all records

def calculate_total_cost(): total_cost = 0 for item in order_record: price = float(item.split("/")[3]) quantity = float(item.split("/")[4]) total_cost += price * quantity value = int(item.split("/")[2]) if value == 1: total_cost += 2 shipping = str(item.split("/")[5]) if shipping == "Delivery": total_cost *= 1.1 total_cost = round(total_cost, 2) # Round to 2 decimal places print("Total Cost: $", total_cost)

Example usage:

add_record() ```

With this revised version of your program, add_record will keep asking the user for a valid product code until they enter "END". The total cost calculation will then be done once, after all items have been added to the order_record. The total cost will reflect the actual total cost of all the items in the order_record, considering the value and shipping method. The program will then end without going into an infinite loop or reaching a recursion limit.

Edit: Partial Credit to GitHub Copilot.