How do I add multiple custom CSS classes to Views rows?
if you're using multivalue class token, this bug report may be of interest for you. There's also a patch as a workaround available.


  Currently if a views field token contains multiple space-separated class names, these classes will be combined into one class when the string is run through drupal_html_class(). Attached is a patch to split token classes before they are sanitized for HTML.