WP_Query with tax_query not returning all posts

Hi there,

When using the “tax_query” parameter in my arguments, I am not getting all the posts returned – but despite this “found_posts” is returning the correct amount. This ONLY happens when using the “tax_query” parameter, the “s” parameter alone works perfectly.

Here are the arguments I am passing http://pastebin.com/0Ak98EHe

Any help with this would be greatly appreciated,
Thanks,
WazzaJB