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PHP has the tendency of adding session IDs to links if cookies are rejected.
Check your phpinfo to see if –enable-trans-sid is enaled. It usually is with default PHP installation.
If you have access to in php.ini: set "session.use_trans_sid" to false
If you don’t have access to php.ini, try add the following line to the .htaccess file:
php_flag session.use_trans_sid off
It may not work if your provider's PHP master values overwrite your local values at runtime.