Some translations set poetry farther to the right than the rest of the text to show that it is poetry. The ULB does this with the poetry in 48:1-25, 28-33, 39-47.
Moab worshiped and served other gods. Despite this, Yahweh expected every nation to worship and serve him and him alone. They were punished because of it. (See: [[rc://en/tw/dict/bible/kt/falsegod]])