Plugin is fantastic!
I'm using it for a site I'm developing just now (locally hosted at the moment so I can't link to it).
Strange problem, I have my selectors all set up and it works fine 'most' of the time, yet the FIRST comment on any post always reloads the page.
The second, third, fourth comments all load in via ajax just fine.
I took some screenshots of the console with Ajaxify comments in debug mode, maybe that'll help you diagnose what's going on.
Here's a screenshot of the web inspector when the first comment (that reloads the page) is posted.
Here's a screenshot of the web inspector when the second comment (that loads in via ajax perfectly) is posted.
I had to blur out the site name since it's a client development, but all the other info is there.
Thanks for the help!