Hello dvoid,
I have checked your site with fpt account that you gave.
All your files and folder are owned by clubanticrist account, and it’s not allowed for php script to create and update file and folder (I have tried to config ftp account under global configuration page >> Tab Server >> FTP section). But it is unsuccessful as I received this message.
JFTP: :write: Bad response
Could not save data. Error: Could not write to the configuration file
So, Please go to the configuration page (that I mentioned above), try to config and enable FTP settings with account clubanticrist and test again