No symlinks, owner as number instead of name

Hi, is it a bug or some setting? The number is shown in place of the owner name. Also, I don't see the symlink which is visible after using ls -al in PuTTY.
Everything works fine on the other FTP server. Is it the server's fault or something wrong with WinSCP? Thank you for your help.

WinSCP shows the information the FTP server provides. So most probably it's your FTP server issue.
Post session log file, if you want us to check deeper.
All you can try on WinSCP side is turning off Use MLSD command for directory listing:
https://winscp.net/eng/docs/ui_login_ftp
Just in case your SFTP server has MLSD poorly implemented.