I've noticed this will happen on pets without names. (I've since made it since pets will be by default named 'Unnamed' when created, to prevent this.) Another workaround is to change the title in
levelupview.php to:
PHP Code:
$document->setTitle("{$adopt->getName()} ");
Including will insert in a blank space in addition to the title (which is just the adoptable's name).
There may be more to it than this, but... that's one issue I've had in the past.