First Person Character Floats when getting higher

So my problem is that when my first person character goes higher (next floor up the stairs), he suddenly starts acting weird, he floats and moves slowly.
What’s the problem?
Thanks!

Could be a lot of things. My first thought would be to check collision properties between the player and the stairs/meshes in your scene, make sure gravity is enabled under physics. Make sure simulate physics is checked etc. There isn’t really much to go on from this description of the behavior though.