qr code adding saving phone number on one property but not on other

Hello i added this code
$data['Phone'] .= '; '.$seller['Fields']['phone']['value'];
after
$data['Phone'] = $this->getPhone($seller);
in public function generateQR_Code

on one property its saving the phone number of user using qr code but on another its not
also its adding a ; semicolon before the phone number , why is that ?

kindly tell me what is the mistake and how can i save phone number of all users
PLEASE HELP
See screenshots here
working = https://ibb.co/ZXsMJtW
not working = https://ibb.co/v4HVT8P