ftp for 3 domains all point to same place?

[swanzey]

I have set up 3 domains via plesk on my server. they all have the same name with a different com/net/org. When I ftp through my browser, they all point to the same directory of one of the 3 sites, yet each within plesk file manager have a different directory.

Isn't this unusual, and what can be done to correct it?

thanks in advance.