Certain models from the Infinity Blade pack don't appear at launch

So I downloaded all the Infinity Blade packs, and began using them in my project. However, when I click “Play” they all appear fine, but when I click “Launch”, a few do not appear. Is there any specific reason for this? On the Marketplace, it does state that the Infinity Blade packs are compatible with 4.18, so I am a bit confused here.

Same issue, except its when I package the game…