Product Add-ons Price of add-on not in total price on cart

I’m having trouble with Product Add-ons. The add-ons show up fine on the product page. The customer can put a check in the box for the add-on they desire. Then, on the grand total price on the ‘product page’, it adds up correctly. So if the product costs 50.00 and add-ons are 10.00, on the product page it shows a grand total of 60.00. However, I then go to checkout and it displays the chosen add-on and the cost for the add-on, but this is no longer in the total price on the checkout page. So the checkout page only shows a grand total of 50.00. Since this isn’t working correctly, my customers can’t purchase or pay for their desired add-ons. Is there some code I need to add or a setting I’m not seeing? Also, I do not have WPML installed which I saw had a conflict at one time. Any help is greatly appreciated!

https://wordpress.org/plugins/woocommerce/