I agree that good software must be as tolerant as possible to carelessness. If the rotation problem is so common, I should do my best to provide that kanji can be drawn at any angle, even upside down. In other words, I should make JiPad self-adjustible. But this can't be done quickly. In the meantime, it is better to remember that a vertical stroke should be drawn vertically, and a horizontal one - horizontally.