1)
Here it says "Beis Leva'os v'Sharuchen." Above (15:32) it says "Leva'os v'Shilchim", and in Divrei ha'Yamim (1:4:31) "Beis Bir'i uv'Sha'arayim"!
1.
Malbim: V'Sharuchen is what is in front of the city. Above (15:32) it is called v'Shilchim, like "Shelachayich Pardes Rimonim" (Shir ha'Shirim 4:13), i.e. a Bein ha'Shelachim (irrigated field) in front of the city. Here it is called Sharuchen, for afterwards there were no fields, and it was an adjunct added to the city. When Divrei ha'Yamim was written, there were gates in front of the city, it says Sha'arayim.
2)
Why does it say that there are 13 cities? There are 14!