Multisphere parallel error with a moving wall

Dear all,

I come back to this topic again. I had time last week to make some test cases for multisphere.
I upload one of them.

LIGGGHTS360 was used for this simulation. The multisphere was only composed with two particles.

what I did was:
1. make a packing in a region with a stepped wall, saved as a restart file.
2. restart the case from the saved restart file and simulated it further using a moving wall.

The single core simulation can go through without any problem. But if I simulated it with parallel with the moving wall, after several 100000 iterations, depending on how many cores did I use, the particle packing exploded.

I am not sure, is this a bug or I did something wrong.

I tested the case also using Version370, I got the same problem.

Does anybody have an idea? What is the problem?

Thanks a lot!

best regards

Zhen