i have Fe2S2 cluster linked to two histidines and two cysteines. i tried editing the topology file and i changed the name of HIS, CYS and the cluster to FES. i edited the topology file. but after running psfgen, the hydrogens are not being added properly, hey are being added with the coordinate 0.00 and it is distorting the other HIS and CYS. i dont know what am i doing wrong.