If you look into the character movement of the default character you can see it has a crough height collision. Pretty sure that if you set it up right, it should automaticly adjust the collision. So either you didn’t take the crouch variable from your character moment into your code, or your object is lower then the crouch height. Make sure you are communicating anything linked to crouch and speed with your character movement and adjust the crouch height if needed. Let me know if this helps 
(It is pretty basic, but who knows :P)
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