Tippy.js conflicts with Bootstrap based themes over .popover class
The approval icons popover won't show if the theme is based on bootstrap.
Bootstrap's .popover class hides the approval icons.

Tested with GV 2.9.1 and Bootstrap v3.3.7 (http://getbootstrap.com)
https://blog.hubspot.com/website/free-bootstrap-based-wordpress-themes
https://secure.helpscout.net/conversation/1310704922/29770/
https://secure.helpscout.net/conversation/1342890630/30710
Workaround:

.tippy-content a.popover{
border: unset !important;
position: unset !important;
display: unset !important;
}
https://secure.helpscout.net/conversation/1482621705/33797
https://secure.helpscout.net/conversation/2268792109/49689
FreeScout #78161.
https://support.gravitykit.com/conversation/78161?folder_id=1