In the early days of writing, there was no fixed pattern in writing. The two horizontal lines on the word "Ji" in seal script are long and short, short and long, or even the same length:
Official script inherits the characteristics of seal script, and it still has everything:
In fact, during the regular script period, it was still like this. Modern people regard it as the aesthetic taste of calligraphy and don't worry about standardization or not.