In the current patch, Spiro, Techno and Ancient (Normal Mode) sets have the old models brought back. We announced this a while ago in blog posts, but the names of the two sets are named identically, so it’s bringing confusion.
In tomorrow’s patch, we will be making it so the Hard Mode/Expert Mode show up in your list as Normal Mode models until/if we add in the Hard Mode models (which are the same as Expert), at which time the models will be updated automatically.
Note that you’re not losing anything if you dismantle them now! You don’t see it, but they are saved to your character data.
Thanks.