Hi there,
I am sorry for the delay of this reply.
Regarding your issue, are you referring to Payplans's plan upgrade or, are you referring to EasySocial's profile switch?
If you are referring to Payplan's plan upgrade, I've checked your Payplans and there is no 'upgrade' app installed in your Payplans. Please see
http://take.ms/fZdad
You can find this app from your Payplans under apps -> visit app store page.
By the way, how you actually upgraded your user's plan from your Payplans?
If you are referring to EasySocial profile switch, in order to change the user's joomla group as well during the profile switching, you will need to enable this option from your EasySocial. Please see
http://take.ms/WIgHB
You can find this setting at EasySocial backend under settings -> users -> general -> Profile Type Switching
Please advise.
Hope this help and have a nice day