Why does version two of this simple calculator work as it should while version one does not? Is it because of the order of the operators in the code?

Question

Here is version 1 of my simple calculator.

num1 = float(input("Enter first number: "))
op = input("Enter operator: ")
num2 = float(input("Enter second number: "))

if op == "+":
    print(num1 + num2)
elif op == "-":
    print(num1 - num2)
elif op == "*" or "x":
    print(num1 * num2)
elif op == "/" or "divide":
    print(num1 / num2)
else:
    print("You have not entered a valid number or operator")

Now, here is version two of my simple calculator.

num1 = float(input("Enter first number: "))
op = input("Enter operator: ")
num2 = float(input("Enter second number: "))

if op == "+":
    print(num1 + num2)
elif op == "-":
    print(num1 - num2)
elif op == "/":
    print(num1 / num2)
elif op == "*" or "x":
    print(num1 * num2)
else:
    print("Invalid operator")

Could someone tell me why all of the operators in version two while one of the operators in version one doesn't work in the PyCharm IDE?