Problems about the adsorped structure

Yes, i used the [Hmim][Nf2T] to capture CO2, the initial configuration used for GEMC-NPT is a cubic and obtained from MD performed by gromacs (10ns NVT and 30ns NPT). But after the GEMC-NPT, as you can see from the snapshot, the configuration divided into four parts. Is this normal? Here, i aslo attached the other files used in this simulation.

As you see from my input file, it's 1 bar, not a high pressure, but i think it should not separate into 4 parts.

# Pressure_Info
1.0
1.0

I have already uploaded the input files, did you see? Here, i upload them again.

Thanks a lot.

Qingwei Gao