Why are there so many messy chapters in calligraphy works?

When a painting is quietly drawn, it will be stamped with the author's own seal (including his own name seal, as well as some random seals, such as font quotation, Zhai's name seal, concubine seal and so on. If the works are collected by others, the collectors will also affix their own seals and pass them on from generation to generation, and some works will have many seals.