Shift between DEM particles position and CFD

Hi,

I'm adapting the settlingTestMpi tutorial case to work with interfoam (2-phase VOF).

It works fine in general, the only problem is that I get a space shift in paraview when looking at actual particle position, and voidfraction value in the CFD grid.

I made sure that I capture the same number of snapshot in both DEM and CFD (and the shift is always the same).

Somehow, I think the CFD is lagging 1 time step behind DEM. I guess it comes from the 0 time step ...

Where could it come from ?

Thanks !
Joris