I can't speak about installing games via ULGX because I... don't know anything about that at all
But anyway, if you're having problems installing games
to your hard drive from your PC, then yes that is an abnormality.
Make sure your USB Stick is formatted with default settings in FAT32 and that you are adding clean rips of the games with Wii Backup Manager.
If you're still getting problems, try using SDFormatter to format your USB Stick. In the past, SDFormatter has done what Windows couldn't do by fixing up my SD/USB.