Problems with camera orbiting the player based on mouse input (C#)

Hey so I stumbled across a problem which I have been trying to fix for a while. So I was trying to make it so the camera would only rotate down to a specific axis (40 to 270 for my game), what happened was that when ever I started the game it would automatically rotate up to I believe 270 and then not allow me to put in any mouse input.

To add in the error only started occurring once I added in the mathf.clamp

 void LateUpdate()
     {
         float X =+ Input.GetAxis("Mouse X") * MouseSensitivity * Time.deltaTime;
         float Y =- Mathf.Clamp(Input.GetAxis("Mouse Y"), YMinimum, YMaximum) * MouseSensitivity * Time.deltaTime;
 
         Vector3 MouseMovement = new Vector3(X, Y, 0);
     }
 
     void Update() {
         rigidbody.transform.position = (transform.position - target.transform.position).normalized * Distance + target.transform.position;
 
         if (target != null)
         {
             //Allows the camera to rotate around the camera based on mouse movement.
             transform.RotateAround(target.transform.position, MouseMovement, Time.deltaTime);
             transform.LookAt(target.transform);
         }
     }

Thanks for reading, would be amazing to get this problem sorted!