Group Registration Form Not Working

For some reason the dropdown that lets you select how many members are in your group is no longer working on my site :
www.pdsmemphis.org/parents/register-for-events

Any suggestions as to what could be wrong?

Hi Winston

I think there might be some javascript conflict (causing by changes on your site) causing the issue.

Please submit a support ticket sending us super admin account of your site, I am going to ask my developer to check and solve it for you

Regards,

Tuan