Why do you end up with something different if you update in a different order?

I'd say it's because I should be updating in both cases, rather than starting with "I am an animal" or "I am a human". I should start with "I am conscious", because I can't not be, and then update from there.

I'm trying to show that picking reference classes arbitrarily leads to a contradiction, so SSA, as currently stated, doesn't work. If it does, what other solution is there to that paradox?