If the timer applied a coupon, the coupon comes off — unless you set The coupon when the timer ends to keep it — and the shopper sees your expired message. The cart is not emptied, no items are removed and nothing is cancelled.
The page reloads once at zero only when the timer is set to take its coupon off, so the total on screen is the one they will pay. With no coupon, or with the coupon kept, the expired message just takes the countdown's place, so a shopper half-way through the checkout keeps what they have typed.
Still stuck? Ask the developers who wrote it. We aim to reply within one business day.
