I don't know the meaning of this warning.(using dpm model)
 

When using the dpm model to trace particles, this warning appears.

(WARNING: 39.0391% of the total discrete phase mass were behind in time by, on mass-weighted average, 0.0002 s, which is 0.0000% of their total age or 0.0067% of the last time step 983 more time steps).
how does this affect calculation? or What does this warning mean?
please help me