Twitter App Not working properly

Hi i am using teh perch twitter app and this pioece of code in the FE:

perch_twitter_get_latest(array('twitter_id'=>'@Swallowtailhill', 'exclude_replies'=>1, 'count'=>1), true);

However, this doesn't return anything. If i do this i get some results (up the count)

perch_twitter_get_latest(array('twitter_id'=>'@Swallowtailhill', 'exclude_replies'=>1, 'count'=>10), true);

It also doesnt return the latest ones, but like the 3rd latest. In teh admin its accurate . Why is this - what is going wrong here?

Thanks