Hello,
this may happen for a number of reasons. When a single file, link or subfolder is inaccessible, then the whole folder listing fails and an empty folder is presented by sshfs-win.
Check these things:
access permissions - all folder items are remotely accessible via ssh daemon
all your symbolic links in the folder are online, mounted and accessible
filenames are not longer than 255 characters
if nothing else helps, then try to avoid prohibited, special, national, non-latin characters in filenames.
I'm trying to use sshfs-win to enter my music library on my Sailfish OS phone, but when I enter the folder is empty.