Hi.
First, excuse me for my english (I'm french).
Apparently this is a bug for PS 1.6.1.1. If you update your PS to the latest version, there will be no new records.
But if you don't want update, just change this line (line 446 in function updateValue() )
$result &= Db::getInstance()->insert('configuration', $data, true);
to
$result &= Db::getInstance()->insert(self::$definition['table'], $data, true);
And delete this rows in configuration table (ty jaanrs) :