Move label to RIGHT of checkbox in Webforms
Drupal is spitting out the markup as [title][field] and what you want is [field][title] so to accomplish this you need to override Drupal's default theme implementation of your field. To do this copy example.com/modules/field/theme/field.tpl.php to your theme template folder(if one does not already exist in there ...sites/all/themes/my_theme/templates) and modify the template file to your desired markup.
When naming your template file you can restrict it to the webform fields, Drupal will use the most specific template it finds in the following order:


field--field-name--content-type.tpl.php
field--content-type.tpl.php
field--field-name.tpl.php
field--field-type.tpl.php
field.tpl.php (in your theme)
field.tpl.php (in drupal's field module)


Take a look at this link, Drupal documentation on field.tpl.php

Hope this helps.