prevent parscale from reassinging ids

hello all,

I simulate pyrolysis in a batch rotating reactor with parscale. the solid bed is formed by steel and biomass, and i set different initial conditions for steel and biomass concerning temperature, but after the first timestep parscale reset randomly the initial temperature field I set in the beginning assigning it to other particles in liggghts. You can help me? maybe only giving me an insight to were to look for a fix. attached there are the heat in my "0" folder and after the first time step.

thanks for the attention and the help,

Riccardo Maione