In flamingo/less/forms.less file we are doing
Although this seemed to be right the first time we used it, if you consult Bootstrap's documentation http://getbootstrap.com/css/#forms-controls you'll see that .checkbox class is supposed to be the parent of input [ type='checkbox'] and not just an additional class.
This extend is affecting lots of issues created related to checkboxes and radios, see Related issues.
- Remove the extend and start using the .checkbox class accordingly
- Since we are following .xform standard for most of our forms http://platform.xwiki.org/xwiki/bin/view/DevGuide/VerticalForms I propose we add the .checkbox class to the parent dd element