@Mr_MustacheThe technology of the device is why it happens. The only reason Monster Hunter doesn't work like that is because it's not a drawing game.
Try this. Buy Art Academy and then press two fingers at separate points on the screen. It will think you are pressing in the middle of these two points. Now in Miiverse or anything else, do the same thing. Nothing happens... unless there is something smack dab in that middle spot. It happens in all games. In Art Academy though it's an art game where any touch screen action has an effect.
If their intent is to make drawing on here as life-like as possible, an undo button fucks that up. However, while this issue is a legit one, fixing it would diminish the point of the application. It's easiest to just be careful of where you touch that screen.
In a non-perfect analogy, if I'm drawing on paper and I have a lot of material on it. If my palm rests on it, it might smudge it or transfer. Same concept could be said here. It's nothing to freak out over. You just have to learn the rule and live with it.
The gamepad works the same way with Monster Hunter, but when two points are pressed it typically doesn't quite make an action happen. In the Animal Crossing App, you can click on a character by using this two outer-bounds method, but it wont actually select them. That requires a firm single push. In Art Academy's app, perhaps it's just not that easy, or it's too sensitive, to not do 'something'. And thus, a smudge or line is created.
@Secret_TunnelAh, we were posting simultaneously. Above describes what's happening a little better. It's due to the type of touch screen it is. Had Nintendo gone with the other kind that's popular, it would have been much more avoidable. People need to blame the Gamepad, not the app.
