I've only used goats milk once so I'm no expert, but I suspect the brown / orange colour was caused by the lye/milk mixture heating up and burning the sugars that are naturally present in the milk. As for the curdling, when you add the lye to the milk it will start to saponify the fat in there, and if you don't stir it enough you might get clumps of soap forming in the milk.
When I used goat milk I added the lye in stages, letting the mixture cool down before I put the next bit in, and kept stirring it pretty much constantly. The mixture stayed nice and white and creamy. Sadly the finished soap got a bit too hot in the mould and went orange anyway:roll: