Logout issue with new Domain on WP Multisite

I’m using a multisite and I set my site up at parentsite.com/mysite. When the logout button was clicked it worked correctly and logged the users out and brought them back to the homepage. Here’s what the code was:

<a class="logout with-icon" href="<?php echo wp_logout_url( get_permalink() ) ?>" data-icon=""><?php _e('Log out', 'franklin') ?></a>

Then I bought a new domain name (mysite.com) for the site, installed the “WordPress MU Domain Mapping” plugin and set up the A name to point to parentsite.com/mysite. Everything works fine except now the logout button brings them to the homepage of parentsite.com with this in the url: http://parentsite.com/?dm=cd427564d8195660acb35d2669c96069&action=logout&blogid=8&k=87e709a6777fa366cd42edc1c52f1db9&t=1751394297
instead of the homepage of mysite.com.

I’ve tried changing the above code to:

<a class="logout with-icon" href="<?php echo wp_logout_url('http://mysite.com') ?>" data-icon=""><?php _e('Log out', 'franklin') ?></a>

but that didn’t help. I’ve also tried

<a class="logout with-icon" href="<?php echo wp_logout_url('http://parentsite.com/mysite') ?>" data-icon=""><?php _e('Log out', 'franklin') ?></a>

and

<a class="logout with-icon" href="<?php echo wp_logout_url( home_url() ); ?>" data-icon=""><?php _e('Log out', 'franklin') ?></a>

Any ideas? This is very frustrating and embarrassing.

Thanks!