Some games not showing up in game list

[Drackala]

My modded wii recently crashed, and required a rebuild...including the external usb drive housing my game library. (Still working on trying to get over a 120 games back)
I have it going again, homebrew, usbloader all working fine.  I have installed a WBFS partition on a new drive, and was able to use Wii backup manager to transfer a few games i had backed up onto the WBFS partition, and they play fine...!

The problem, is that games i have downloaded in wbfs format, used two different tools to convert them to .iso files...won't show up in the wii, once i launch usbloader...the Older games are still there...but the new ones-just don't show up.

I have tried WBFS backup manager, and wbfstoiso, to convert the wbfs file...These both seem to work (no errors), and all seems well, but they are not showing up after launching usb loader!  Any ideas??  Why some iso show up, and others don't??