'master list distance cutoff' changes strangely after restarting the simulation

Dear lammps user:

I want to compute the gyration of radius of a single PE chain using airebo potential. After a simulation, I continued the simulation by a read_restart command. Then a strange thing occured that the ‘master list distance cutoff’ changes from 12.2 to 8 in the log file and the gyration of radius also changed a lot. I did not change the pair cutoff and the neighbor artificially.

This is a part of the log information of previous simulation:
LAMMPS (1 Mar 2016-ICMS)
WARNING: OMP_NUM_THREADS environment is not set. (…/comm.cpp:90)
using 1 OpenMP thread(s) per MPI task
Reading data file …
orthogonal box = (0 0 0) to (100 100 100)
2 by 2 by 2 MPI processor grid
reading atoms …
206 atoms
WARNING: Resetting reneighboring criteria during minimization (…/min.cpp:168)
Neighbor list info …
1 neighbor list requests
update every 1 steps, delay 0 steps, check yes
max neighbors/atom: 2000, page size: 100000
master list distance cutoff = 12.2
ghost atom cutoff = 12.2
binsize = 6.1, bins = 17 17 17
Setting up cg style minimization …
Unit style : metal
Memory usage per processor = 5.83205 Mbytes

This is a part of the log information of restart simulation:
LAMMPS (1 Mar 2016-ICMS)
WARNING: OMP_NUM_THREADS environment is not set. (…/comm.cpp:90)
using 1 OpenMP thread(s) per MPI task
Reading restart file …
restart file = 1 Mar 2016-ICMS, LAMMPS = 1 Mar 2016-ICMS
orthogonal box = (0 0 0) to (100 100 100)
2 by 2 by 2 MPI processor grid
206 atoms
Resetting global state of Fix nvt Style nvt from restart file info
Neighbor list info …
1 neighbor list requests
update every 5 steps, delay 0 steps, check no
max neighbors/atom: 2000, page size: 100000
master list distance cutoff = 8
ghost atom cutoff = 8
binsize = 4, bins = 25 25 25
Setting up Verlet run …
Unit style : metal
Current step : 40000000
Time step : 0.0005
Memory usage per processor = 4.10673 Mbytes

All the settings of restart simulation are the same as those of previous simulation. The input files and data file of previous and restart simulations are all attached.

Any advice is welcome and I will appreciate it very much.

PE_17a.data (9.16 KB)

sd_previous.in (2.16 KB)

sd_restart.in (1.75 KB)