WAD Signature Bug - Not Signed

[Zonafer]

Hey.

Whenever I try using a WAD in Dolphin, no matter what type or where I got it, it always warns me that the WAD in question has not been signed by Nintendo. I have used multiple WADs from the NUS Downloader, my Wii, and even a friend's Wii. Although I know that this isn't a very serious bug, could Dolphin not be dectecting the signatures?

[JMC47]

Are you certain the wads are signed by Nintendo? Like, I don't know if the NUS downloaded ones are signed whatsoever since they can install on any Wii.

[Zonafer]

The ones from both Wiis are, though, and they all show the same warning message.

Also, the NUS Downloader sources its files from the Nintendo Update Servers (hence the name). Wouldn't they be automatically signed?