Accounts is over Quota, but can add MySQL record again?

hello.
i see Accounts is over Quota in WHM, but they can adding MySQL record again?

you can loginto cPanel:

http://demoaccount.xon.cn:2082

username & password is :demouser

and see:

this account is over Quota, but please open phpMyAdmin in thie cPanel or click this URL:

http://demoaccount.xon.cn:2082/3rdparty/phpMyAdmin/index.php

select a DB, you can add any record and datas into, why? it's mean user can use unlimite MySQL disks?

please help, thanks man

 

yes, but can't fixed