Issue domain ftp showing iis default files

[plesk_user9807]

Hello, I have this strange issue. I have setup a domain in windows plesk 12 and have added ftp user. I have also set ftpdir to httpdocs but whenever I connect to ftp I see following files/folder

aspnet_client
iisstart.htm
welcome.png

I think this is iis default page files. What is wrong with ftp? This is happening for all domains in server.

Windows server 2008 R2
Plesk 12.5.30