Camera is constantly locked on the Y-Axis

Hello, fellow Unity-users,

i'm having a very strange bug in my current game. Whenever i start the game and look around, the camera always seems locked on the y-axis(horizontal rotation). The playermodel rotates just fine but the camera does'nt rotate with it. Vertical rotation works just fine... so i have no idea why this happens.

 using UnityEngine;
 using System.Collections;
 
 public class CamLook : MonoBehaviour 
 {
 
     public enum LookType
     {
         Horizontal,
         Vertical,
         Both
     }
     public LookType lookType;
     //
     public bool canLook = true;
     //
     public float lookSens;
     //
     public int minVertical = -90, maxVertical = 90;
     //
     float xRotation, yRotation;
     //
     private float smoothing = 0.02f;
 
 
     void Update()
     {
         if (canLook) 
         {
             if (lookType == LookType.Horizontal) 
             {
                 xRotation += Input.GetAxis ("Mouse X") * (lookSens * smoothing);
 
                 transform.rotation = Quaternion.Euler (0, xRotation, 0);
             } 
             else if (lookType == LookType.Vertical)
             {
                 yRotation -= Input.GetAxis ("Mouse Y") * (lookSens * smoothing); 
                 yRotation = Mathf.Clamp(yRotation, minVertical, maxVertical);
 
                 transform.rotation = Quaternion.Euler (yRotation, 0, 0);
             } 
             else 
             {
                 xRotation += Input.GetAxis ("Mouse X") * (lookSens * smoothing);
 
                 yRotation -= Input.GetAxis ("Mouse Y") * (lookSens * smoothing); 
                 yRotation = Mathf.Clamp(yRotation, minVertical, maxVertical);
 
                 transform.rotation = Quaternion.Euler (yRotation, xRotation, 0);
             }
         }
     }
 
 }
 

i set it up like this: The player itself is an empty gameobject with the CamLook script attached to it (set to horizontal movement). the camera is a child of the player(set to vertical movement)

Thanks in advance :)