Ok, so I've scanned through whole log and I've found records of similar files.
Indeed your server does not send any size nor timestamps for any of the files.
While WinSCP might cope with that better (than by showing "30.12.1899" and zero size), there's no way it can show a really useful information there, as the server does not provide it.
The reason you can see the information in OpenSSH
might be that the OpenSSH supports SFTP version 3 only. While WinSCP supports SFTP up to version 6. Your server implements SFTP 6, so WinSCP uses that. But the server might have SFTP 6 implementation broken. Try forcing WinSCP to use version 3 in session settings: