problem with membership

something is messed up with the membership plugin. I have the gateway set to 2checkout and everything works on this form

https://www.michaelsharp.org/register/

except the Student/Low income Subscription and the Test Subscription. for some reasons when these are selected the 2checout icon does not come up. with the student/low income option the icon is simply missing (giving no option to pay) and for the test subscription the icon is the paypal one. i don't know why this is since paypal is disabled and 2checkout works on the others. sounds kinda buggy to me