why is my character falling pass the ground

so i used a character model from 3d warehouse to make a game with that character but he keeps falling pass the ground even though the character has a colider and the floor has one as well. i put a new terrain to make sure the coliders are working and they do but for some reason not on the floor i’m trying to use. i need as much help as i can get.

You may have a problem with layers:

Also make sure they aren’t marked as triggers.