Floating Social not displaying properly

Hi, I am currently using Floating Social and it is not displaying properly. Sometimes it shows, others it starts to show, indented to the right in the middle of text then dissapears. Can you advise if this is a common problem?

Also can you please advise what plugin you use in the WPMU Blog for your Social Hover bar and buttons at the bottom of your posts? I would love to emulate this if possible.

Thanks