Only on Event and Group activity that is displayed on Wall there are 2 drop-down option boxes with options like Hide or Delete.
One is in joms-stream and the other in joms-stream > joms-stream__header. In most cases they overlap so "error" is not visible.
I know this is pure cosmetic issue and those 2 elements are overlapping but it is bugging me. Here is a screenshot from your demo:
This is happening on Groups and Events posts.
For Groups activities fix is:
...\components\com_community\templates\jomsocial\layouts\activities\groups\base.php
comment out line 35
For Events activities fix is:
...\components\com_community\templates\jomsocial\layouts\stream\events.php
comment out line 39
