Well if the enimes have a platform behavior themselves to move around and all that they will fall through that platform as well if the platform isn't solid anymore because they need something solid to walk on. I'm assuming you're making the platform not solid anymore or something like that so anything else that has a platform behavior like the enimes will just fall through it. Really can't do anything about that unless you make the enimes fly so you might have to come up with another idea. I'm sure you'll figure something out so good luck 👍