some questions about serial and parallel environments

if the results is different when i run the simulation under the serial and parallel environments , and the result under the parallel environment(use 16 cores) is wrong, what is the most possible problem?

if the results is different when i run the simulation under the serial and
parallel environments , and the result under the parallel environment(use
16 cores) is wrong, what is the most possible problem?

the biggest possible problem _right now_ is, that your question is far
too vague and lacking any kinds of meaningful detail to give a useful
answer.

http://lammps.sandia.gov/guidelines.html

axel.