Those come from MBtags.php uploaded by Meteobridge. Your 'yesterday' numbers are all missing (--) like $WX['th0temp-ydmin'] = '--'; // outdoor temperature min of yesterday
$WX['th0temp-ydmintime'] = '--'; // outdoor temperature timestamp min of yesterday
$WX['th0temp-ydmax'] = '--'; // outdoor temperature max of yesterday
$WX['th0temp-ydmaxtime'] = '--'; // outdoor temperature timestamp max of yesterday
Maybe your Meteobridge rebooted and lost the values for yesterday?