Difference between graphs

Difference between graphs

Can someone tell me why these two graphs show the consumption values of liters / hour differently.

The first in my opinion works well: it exposes the water consumption per hour and does not accumulate the record

The second graph with the same variable is accumulating the value hour after hour and results in another different graph, in my unrealistic opinion.

I like the format of the second graph better, but I would like it to work like graph 1.

Thank you