vishvakarma
Hi
Before conti. support on this topic, Kindly share your active membership details of JomSocial. User must have an active subscription to get updates and support.
for your current question: I tested Jomsocial groups settings and they are working fine, We do not own the payplan extension, for the issue, if the payplan is not compatible with latest version of Jomsocial you may report it to extension support team as payplan is 3rd party addons of Jomsocial.
Regards