When adding items to your shopping cart on https://iitap.com, please note the following: 

If your total balance is reflecting a greater amount than what your registration should be, you might have additional events in your cart. To remove them, follow the steps below:

• On the checkout page, scroll up and find the shopping cart icon towards the top right side, like in this screenshot:

• If the number next to the cart is greater than (1) then you have previous pending registrations you need to remove.

• To remove them, click on the cart icon and on the following page you'll be able to remove everything except the registration you're trying to sign up for.

• Proceed to check out once your cart is back in balance.