TOPIC: Fields auto checked

I have a client who has been working but wanted some of the features in 2.7.x. The upgrade seemed to go fine. This client does seminars and sells books for the seminars. When someone registers they have the option to purchase books at that time, however it automatically selects one of the first two books and adds it to the price. I have removed those fields and recreated entirely but the same thing happens.

This is annoying at best, but the real problem is it selects the one of the first two checkboxes and then the check disappears but it still adds it to the price. So the user does not see what is checked to know what to uncheck. It happens pretty fast and took a while to notice it. I even tried entering a checkbox that says "No Books" for $0 but the problem is it doesnt always check the first one sometimes it is the second or third. I know there is a option in the field, but only the "No Books" option is automatically selected I have tried it with selecting nothing, or specific books and it seems to just do what it wants.

BTW I have opened a ticket last week but have not heard anything.

Thanks in advance