I've noticed this as a common typo for Nanoha images, even ones that are already uploaded and tagged right by someone else. Mug-G, you just did it for two Narutaki Shin images, but I think someone else made the mistake a number of times before.
Who it was doesn't really matter to me, and when I see it i fix it, but I just wanted to post this as a heads up, because I think someone might have "mahou_shoujo_lyirical_nanoha" (as opposed to "_lyrical_") saved as a favorite tag or something, or might have it showing up in their danbooruup tag history, etc. And so it can be easily corrected.
At any rate, just something small I noticed, thanks.
Updated by wanchan