Customers can no longer add notes when placing a PayPal order through my site

Our site, russfinancialschools.com, includes PayPal buttons to order classes that we offer. We have always checked the box to give students the option to add notes so that they can let us know if they are ordering a class for someone other than themselves, etc. Although that box is still checked for every course offering, there is no longer a place to enter the note when placing the order. This creates a lot of confusion for us as well as the students.