Why can my character go through objects with collides on them?

Hello. So, i have a character in my game that I a working on. for the most part it works perfectly fine, but Until i recently change the character movement behavior to something that works, My character can walk right through an object. For example, I have the box in my setting and when i should be colliding with it, I go straight through it!. In case you need to know, my 3d model is parented to the camera so the movement script works, and the camera has a rigid body component attached to it with continuous dynamic physics. Here is the script for my character movement:

 using UnityEngine;
 using System.Collections;
 
 public class PlayerMovement : MonoBehaviour {
 
     public float speed = 6f;
     Vector3 movement;
     Rigidbody playerrigidbody;
     bool IsFlying = false;
 
     void Start () {
 
         playerrigidbody = GetComponent<Rigidbody>();
     
     }
     
     // Update is called once per frame
     void FixedUpdate () {
       // movement
         float h = Input.GetAxisRaw("Horizontal");
         float v = Input.GetAxisRaw("Vertical");
         move(h, v);
 
         float Xrot = Input.GetAxisRaw("Mouse X");
 
         transform.Rotate(0, Xrot, 0);
 
 
         Vector3 speed = new Vector3(h, 0, v);
 
        speed = transform.rotation * speed;
 
         if (Input.GetKey(KeyCode.Space))
         {
             if (IsFlying == false)
             {
                 IsFlying = true;
                 GetComponent<Rigidbody>().velocity = new Vector3(0, 6, 0);
                 
             }
         }
 
     }
 
     void move (float h, float v)
     {
         Vector3 Speed = new Vector3(h, 0, v);
 
         Speed = transform.rotation * Speed / 7;
 
 
         movement.Set(h, 0f, v);
 
         playerrigidbody.MovePosition(transform.position + Speed);
     }
 
     void OnCollisionEnter(Collision col)
     {
         if (col.gameObject.name != "prop_powerCube")
         {
             IsFlying = false;
         }
     }
 
 }