America Opportunity Tax question for 3 children in college

I have 3 children in college (2 freshman and 1 senior). Going through the 2 freshman was pretty standard and we received the AOT refund. When I input my 3rd daughter's info, as soon as they ask the 1st question (Is she working towards an associate's, bachelor, or graduate degree) , when I input "yes" (same as for the other 2) it immediately reduces our refund by $1526 dollars.  She has received this the past 3 years, but should be able to receive 1 more year. I just don't understand why it would reduce our refund before asking any other questions.