1)
Why does it say that that Yehudah conquered Chevron? In Sefer Yehoshua, (15:14) it says that Kalev already dispossessed the giants!
1.
Radak: It means that they already conquered it. Malbim - there it is attributed to Kalev; he was the head of Yehudah, and they followed him. Chevron itself was given to the Leviyim, Kalev received the field of (around) the city, and the Chatzeros.