Q2W3 works only on Firefox (doesn't works on Chrome, Opera)

First thank you for this great plugin.
I am using Renad theme (demo http://themes.bdayh.com/?theme=renad) and installed the plugin, but it works only on Firefox. I’ve try with opera and chrome but it doesn’t works.

I appreciate if you see and check what is the problem. my site is
http://simonaoberhammer.com/blog/

Thank you Max!

https://wordpress.org/plugins/q2w3-fixed-widget/