I’m not sure if the following is an issue or not.
One of my Items is marked as trending (http://codecanyon.net/item/ajax-translator-revolution-wordpress-plugin/1108823), but is not trending when it’s displayed on a search, lets say: http://codecanyon.net/search?utf8=✓&term=ajax+translator+wordpress
I’m posting this here instead of contacting support, as the trending feature is changing all the time, so hopefully someone from Envato will see it soon.
Cheers