There are 3 possible reasons.
An ingredient is not allowed in your country.
Some countries do not allow Muira Puama or Tribulus. If your order includes an item with one of these ingredients, we will replace it with another item that is equivalent or superior.
There has been a manufacturing error.
It's very rare, but it can happen. In this case, customer service will suggest a solution to resolve the problem.
The product was out of stock.
Just as rarely, a product that was in your shopping cart may be out of stock when you place your order.
If this happens, you will be notified immediately at the top of the checkout page, which shows the final contents of your cart. So you can place your order with full knowledge of the facts.