2) It has ten horns, but now they are on its head.
Daniel had already seen the ten horns rising out of the fourth beast earlier in the vision, but now they were on its head. What did this mean? Previously, the ten horns seemed to be coming out of the beast as if they were newly emerging powers. But now, they were fully formed, established on the head of the beast itself. This suggested a shift in power—something had changed, but Daniel didn’t understand how or why.
Not 10 horns on all 7 heads, only on one head. Keeping in mind that the book of Revelation reveals that the beast has 7 heads. Which is also shown in Daniel 7.
Daniel 7:4 The first was like a lion, and had eagle's wings: I beheld till the wings thereof were plucked, and it was lifted up from the earth, and made stand upon the feet as a man, and a man's heart was given to it.
5 And behold another beast, a second, like to a bear, and it raised up itself on one side, and it had three ribs in the mouth of it between the teeth of it: and they said thus unto it, Arise, devour much flesh.
6 After this I beheld, and lo another, like a leopard, which had upon the back of it four wings of a fowl; the beast had also four heads; and dominion was given to it.
7 After this I saw in the night visions, and behold a fourth beast, dreadful and terrible, and strong exceedingly; and it had great iron teeth: it devoured and brake in pieces, and stamped the residue with the feet of it: and it was diverse from all the beasts that were before it; and it had ten horns
Verse 4 equals 1 head. Verse 5 equals 1 head. Verse 6 equals 4 heads. Verse 7 equals 1 head. 1+1+4+1=7. And it is the head meant in verse 7 that the ten horns are upon.
In the event you already agree, I didn't submit this to dispute anything you submitted. I submitted it in order to further clarify things.