Problem:
Jomsocial relies on 4 main features: VIDEOS, EVENTS, PHOTOS, and GROUPS where the setting to enable/disable it can be found in admin backend. The usability problem come when you disable one (or more) of these feature, the User Preference Page (index.php?option=com_community&view=profile&task=preferences&Itemid=378#emailPref) still showing the feature setting that you already disabled/turn off

Site Impact: Low, this is not a bug that can leads to serious error, but can little bit impact on user experience as User will be wondering what this setting is all about, they tried different setting but has no impact on them, for some user, this can confused them and arise questions to admin

Solution:
1. Open com_community/templates/default/profile.preferences.php
2. Find:

if ($notificationTypes->isAdminOnlyGroup($group->description) && !$isadmin) {
						continue;
						}

if($config->get('enablevideos')=="0"&&$group->description=="COM_COMMUNITY_NOTIFICATIONGROUP_VIDEOS"){
							continue;
						}
if($config->get('enableevents')=="0"&&$group->description=="COM_COMMUNITY_NOTIFICATIONGROUP_EVENTS"){
							continue;
						}
if($config->get('enablephotos')=="0"&&$group->description=="COM_COMMUNITY_NOTIFICATIONGROUP_PHOTOS"){
							continue;
						}
if($config->get('enablegroups')=="0"&&$group->description=="COM_COMMUNITY_NOTIFICATIONGROUP_GROUPS"){
							continue;
						}

Hello Viktor

I have replicated this bug and already reported it to the tracker

It should be fixed for version 3.1.1

Thanks