I made the same mistake too when I read the bill. It could be a lot more clear for sure.
After a further look at my bill, I have it figured out.
What's list is not before and after price, but new prices for tiered customers (不同时段的收费) on the left, and non-tiered (first threshold of 600 kwh) on the right. It's about 2-3% increase for most people.