Source of Particle Tracking (MIKE Flow Model FM)

Hello,
I've got five sources of particle tracking and the simulation time is approximately six month. After I play the simulation result, all of the sources didn't appear at the beginning, they appeared one at a time, although in the end they all appear. Is it wrong? Help

Hello Dannisa,
the problem maybe in time step setting in output specification, try equated "first and last " for all source,