PerchSystem::redirect(); blocking rendering in Perch 3 and Members

I've got a site where users login via a page called /login/. On entering their details, it should direct the user to the page /feeds/. However, it stays on the login page and blocks rendering of anything below it.

This is the code below:

  <?php if(perch_member_logged_in()): ?>
    <?php PerchSystem::redirect('/feeds'); ?>
  <?php else: ?>
    <div class="feeds">
      <?php perch_members_login_form(); ?>
    </div>
  <?php endif; ?>

Anyone able to spot what is blocking rendering?