The first thing that I would try would be to disable any third party login plugin thingies but I am just guessing cluelessly.  (I saw that no one had replied)

This is happening because you have not cleared the catche and cookies. You must enable dev mode.
Follow this instruction:
using FTP go to ow_includes>config.php
download config.php back to your computer and open it in text format. I will look like this:
<?php

define('OW_URL_HOME', 'http://www.bookerzmedia.com/');

define('OW_DB_HOST', 'localhost');
define('OW_DB_PORT', null);
define('OW_DB_USER', '');
define('OW_DB_PASSWORD', '');
define('OW_DB_NAME', '');

define('OW_DB_PREFIX', 'ow_');

define('OW_DIR_USERFILES', OW_DIR_ROOT.'ow_userfiles'.DS);
define('OW_DIR_STATIC', OW_DIR_ROOT.'ow_static'.DS);
define('OW_URL_STATIC', OW_URL_HOME.'ow_static/');
define('OW_URL_USERFILES', OW_URL_HOME.'ow_userfiles/');
define('OW_DIR_PLUGINFILES', OW_DIR_ROOT.'ow_pluginfiles/');

define('OW_PASSWORD_SALT', '');

define('OW_DIR_CORE', OW_DIR_ROOT.'ow_core'.DS);
define('OW_DIR_INC', OW_DIR_ROOT.'ow_includes'.DS);
define('OW_DIR_LIB', OW_DIR_ROOT.'ow_libraries'.DS);
define('OW_DIR_UTIL', OW_DIR_ROOT.'ow_utilities'.DS);
define('OW_DIR_PLUGIN', OW_DIR_ROOT.'ow_plugins'.DS);
define('OW_DIR_THEME', OW_DIR_ROOT.'ow_themes'.DS);
define('OW_DIR_SYSTEM_PLUGIN', OW_DIR_ROOT.'ow_system_plugins'.DS);
define('OW_DIR_SMARTY', OW_DIR_ROOT.'ow_smarty'.DS);

define('OW_USE_CLOUDFILES', false);

if ( defined('OW_CRON') )
{
    define('OW_DEBUG_MODE', false);
    define('OW_DEV_MODE', false);
    define('OW_PROFILER_ENABLE', false);
}
else
{
    /**
    * Make changes in this block if you want to enable DEV mode and DEBUG mode
    */
   
    define('OW_DEBUG_MODE', false);
    define('OW_DEV_MODE', false);
    define('OW_PROFILER_ENABLE', false);
in the last line, change false to true and save it.  Don't change anything again. Upload the file back to the same position on the server. It may tell you that the file already exists. You must overwrite it. Then open your site site in a browser and push F5 several times. This should make everything fine again. Do this on every page of your site. Check your site again.
You must then change it back to false again and re-upload it.

If anything is not clear, you can contact me on my site at http://www.bookerzmedia.com

Thanks for helping Kumi.

I have worried you a lot. I must help others with what I have learned from you.

welcome