Hydraulic Timestep


I carried on 2 simulations: the first one with Hydraulic time step equals to 10 minutes, the second one with hydraulic time step equals to 1 minute.

Is it normal that outputs at the same time are different? The input data are the same, the only change is the Hydraulic time step from 10 to 1 minute, but output at the same moment, for example after 30 minute are different.

Could Anyone explains me why?

Thank you so much in advance!!