Wii Rock Band 3 album art loading issue

Old game, I know, but I haven't been able to find anything out about this by searching online or in this subreddit, and I was wondering if anyone could help.

Songs stored on my SD card don't always load the album art on the song selection screen. The song previews play just fine (though some can be a bit quiet), but I'd say maybe half of the album covers never load.

Re-downloading the song doesn't seem to fix the issue. I tried using a newer, faster card, but same thing occurs.

If this just a natural quirk of how the Wii version was programmed, an SD card issue, or is something else going on?

Any help would be much appreciated.