Does cricket not go back and forth with whose turn it is? It is one team first and then the other? Or why was Australia such an overwhelming favorite when to someone who has no idea about the sport this looks like South Africa is way ahead?
teams chose in the beginning are they want to bat (other team throws, similar to baseball), on a coin toss, usually team that win coin toss, chose to bat
and South Africa was first to bat, and collect points, there is 50 rounds, and 6 throws in every round
first 8 rounds were as miserable as possible for South Africa (getting 10 points, which is 1,25 points per round), and it was known that they will lose at that point
afterwards they improved and reached 212 points (which is also low, 4,2 points per round), but they didn't had enough players to bat 50 rounds (you can see that they finished at 48.5, so 12 throws less than maximum)
Australia had easy target to reach 212, and they made it
from your pictures, on 130 Australia has 6,19 points per round (way more than 4,2 points that South Africa finished with) - 130/21 - so absolute favorites, and on second picture they have 5,35 points per round (not that much more, but it is close to end, and they needed 32 points from 17 rounds remaining (less than 2 points per round, which is as easy as it gets))
and they finished with 47.2 rounds, so didn't even need all 50 to win