There is nothing wrong with the beginning of the word "Xia", because there were at least six ways to write the word "Xia" in the past, including a little more on "factory".
For example, in Xiamen Soy Sauce Factory in the 1970s, the word "Xia" was written on the product packaging, which was even more praised and criticized during the Republic of China. Even in modern times, you can occasionally see the simple writing of "factory+head" or "factory+bottom" in cities.
Therefore, regardless of calligraphy or single font, Lu Xun's handwriting is not wrong.
At that time, Qin Shihuang said that "books are the same, cars are the same track", and the unification of words is a great achievement in the future, but in fact, the unification of words is mainly for the convenience of our lives. From the fact that "Xiamen University" is mistaken for misspelling, we can see that art is a kind of existence higher than life.