Mobile Redirect Plugins Keep Breaking!

I’m very confused why all mobile redirect plugins break with my wordpress site. I’ve tried deleting all other unnecessary plugins to see if that would help but no. I’ve tried any-mobile-theme switcher, that worked for a bit then firefox started reading the mobile version. I tried MobileESP but that one works the first time it’s ever loaded, then never works ever again on any device. I’m using Yahoo web hosting which adds this bit of php to make the wordpress site my main site:

<?php
/* Short and sweet */
define(‘WP_USE_THEMES’, true);
define(‘WP_IN_ROOTDIR’, true);
require(‘.//fringe/wp-blog-header.php’);
?>

Not sure if this is causing a problem somehow? I’m very confused where the issue is. If anyone has some advice, I’d greatly appreciate it. I’ve been trying to research and troubleshoot for weeks with no avail. Thanks!

main site resides: https://www.fringechicago.com/fringe
mobile version: https://www.fringechicago.com/m