Rough Mobs 2 adds enchanted gear to the mobs, for some reason, mobs spawned using SSR spawner, get their enchants duplicated like so http://prntscr.com/moabe4 ... now im not sure which mod is at fault, SSR or Rough Mobs, but im gonna report it here first..

There is nothing special in my spawning code. You should report this to the other mod.

Fixed with https://minecraft.curseforge.com/projects/rough-mobs-2/files/2691626 (https://minecraft.curseforge.com/projects/rough-mobs-2/issues/37)