Quaternion Rotation On Specific Axis Issue

Hello there,

I try to rotate a cube and I use quaternations, it works correctly on y axis but not working properly on x axis (Horizontal) hope you guys can help.

 public class NewBehaviourScript : MonoBehaviour {
  
      public Transform player;
      Vector3 currentRot;
      Quaternion rotation;
  
      // Use this for initialization
      void Start() {
  
      }
  
  
      // Update is called once per frame
      void Update() {
          currentRot = new Vector3(transform.eulerAngles.x, transform.eulerAngles.y, transform.eulerAngles.z);
  
          if (Swipe.Instance.IsSwiping(SwipeDirection.Left)) {
              //  Debug.Log("Entered Correctly Left");           
              Debug.Log(currentRot);
              currentRot.y += 90;
              rotation = Quaternion.Euler(currentRot);
          }
          else if (Swipe.Instance.IsSwiping(SwipeDirection.Right)) {
              //  Debug.Log("Entered Correctly Right");
              Debug.Log(currentRot);
              currentRot.y -= 90;
              rotation = Quaternion.Euler(currentRot);
          }
          else if (Swipe.Instance.IsSwiping(SwipeDirection.Up)) {
              //  Debug.Log("Entered Correctly Up");
              Debug.Log(currentRot);
              //   currentRot.z += 90;
              currentRot.x += 90;
              rotation = Quaternion.Euler(currentRot);
          }
          else if (Swipe.Instance.IsSwiping(SwipeDirection.Down)) {
              //  Debug.Log("Entered Correctly Down");
              Debug.Log(currentRot);
              //    currentRot.z -= 90;
              currentRot.x -= 90;
              rotation = Quaternion.Euler(currentRot);
          }
  
          transform.rotation = Quaternion.LerpUnclamped(transform.rotation, rotation, 0.01f * 10);
  
  
      }
  
  }