Can't slot xenopetrium into Element Display Rack

I don't have any mods/cc in my game. I'm not getting any last exceptions in my Sims folder. What I am getting is the element just bouncing back to the original location on top of a desk and not slotting into the Element Display Rack. It though doesn't have the red error you get if something is being slotting in a place that doesn't fit. It lights up as if its going to go in, yet bounces back to the original location.