your symptoms mean the file(s) that contain all the long screen names (KN7000MN.INF and KN7000MN.BAK if on a later firmware) have not been saved properly and thus the underlying filenames are being shown in screen.

First backup the card to avoid losing any contents (just copy the whole thing to a folder on the pc).

Try the tool again, write in some folder names and file names, make sure to save, and make sure to safely remove via taskbar icon, it should work ok.