I tried to edit a template with BeBuilder, but it shows my homepage on the workspace.
Please send us the WordPress dashboard and FTP access privately thru the contact form, which is on the right side at http://themeforest.net/user/muffingroup#contact and we will check what might be the reason.
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The root cause is in your child's theme.
I have switched to the parent theme, and the template edit worked correctly.