justify left

your site’s html code has invalidly placed and possibly not closed <center> tag(s) which are likely the cause of the problem;

this is showing in the validation report http://validator.w3.org/check?uri=http%3A%2F%2Ftwentysomethingintoronto.com%2F&charset=%28detect+automatically%29&doctype=Inline&group=0

find and remove the <center> tag(s) – http://codex.wordpress.org/Validating_a_Website

start by looking into the header.php file of your theme (?)