I attached all my files here. you can have a look.
I have tried the latest version of Lammps, but have the same weird
results. you can search "8128 ..." in the force.profile.
please help me to figure out what's wrong. the dumped force is what I
you are seeing the force from fix addforce, because you are applying fix
setforce 0.0 0.0 0.0 to those atoms as well and it is defined and thus acts
before fix addforce.