I am simulating a nancluster of CsPbBr3 with organic ligands attached to all six faces. The nanocluster has been placed in a large vaccum as I am simulating it under pbc. I am doing a temperature ramp where I am heating it from 1K to 200K but when I visualise the trajectory the nanocluster is rotating inside the simulation box. I used fix 1 all momentum 100 linear 1 1 1 angular command but it is still rotating inside the box.