Ok, let's summarize
Although you confirmed several times you had updated Fabrik from GitHub and included the override files into your template you had not (on the site you were working with)
And obviously you have not until now as you still get "span6"
Although you are only on free community level Hugh has tested and proved that two columns are not only working with Purity_III but also with your special template (without any custom css).
So I think it's really up to you to get the correct installation before asking any more questions about issues with your template.
http://fabrikar.com/forums/index.php?wiki/update-from-github/
https://github.com/Fabrik/Fabrik-Joomla-alt-layouts
Although you confirmed several times you had updated Fabrik from GitHub and included the override files into your template you had not (on the site you were working with)
And obviously you have not until now as you still get "span6"
Although you are only on free community level Hugh has tested and proved that two columns are not only working with Purity_III but also with your special template (without any custom css).
So I think it's really up to you to get the correct installation before asking any more questions about issues with your template.
http://fabrikar.com/forums/index.php?wiki/update-from-github/
https://github.com/Fabrik/Fabrik-Joomla-alt-layouts