Any possibility they trying to save space on the paper as much as possible so writing in continuous lines, but somehow marking where lines started on the manuscript from which they were copying?
(I also added a postscript to that last post of I was editing while you were replying.)
The scribe here in Vat.gr.1950 doesn't seem as concerned with maximizing his writing surface. Back in the day, Philodemus's texts would run everything all together. This 14th c manuscript with the Sayings actually has word breaks and will start a new line when the previous saying is done. One component is definitely the start of a new quote, but not consistently... At least from our perspective on what we would expect to be a new quote.