this is a bug that need as soon fixed.If you use a different username for phpbb and wordpress admin, make sure they do not have the same email address, otherwise it will not be possible to log in. I went to the database and changed the wp admin email address to fix this.
About your template that have width not full on page, two reasons:
or your phpBB template is width fixed, that is not the case, as it display more big about width at real url http://www.buddyhollylegend.com/phpbb/index.php
so i think this is a problem about the template that embed the default wp page, as it is build by wp and not by the theme template process.
Can you try to post your default template page.php, as it is on your template folder you use (that is presumably used to create others).