I've converted my games to WBFS format so that I can play them from my HD, I have 12 games on the drive but only 2 show on my WII. They have all been converted using WII back manager , but only 2 out of the 12 are working.
If you are using wiiflow, you have to tell it to update the cache. If you are using something else, they should appear if you installed them correctly.
Which app are you using as a loader and how did you install them to hard drive?