Character randomly looks up or down in a jerky motion 90 degrees

I'm trying to improve my character's mouse movement. This is in a first person scenario, the horizontal movement seems perfect but at random times the look up/look down mechanic go haywire and act on their own. The functions I used for Horizontal and Vertical are the same but I'm not sure what could be causing this.

using System.Collections; using System.Collections.Generic; using UnityEngine; public class MouseMovement : MonoBehaviour { public float mouseSensitivity = 200f; float xRotation = 0f; float YRotation = 0f; void Start() { //Locking the cursor to the middle of the screen and making it invisible Cursor.lockState = CursorLockMode.Locked; } void Update() { if (!InventorySystem.Instance.isOpen ) //remove these) && !CraftingSystem.Instance.isOpen) { float mouseX = Input.GetAxis("Mouse X") * mouseSensitivity * Time.deltaTime; float mouseY = Input.GetAxis("Mouse Y") * mouseSensitivity * Time.deltaTime; //control rotation around x axis (Look up and down) xRotation -= mouseY; //clamp the rotation so we dont Over-rotate (like in real life) xRotation = Mathf.Clamp(xRotation, -90f, 90f); //control rotation around y axis (Look up and down) YRotation += mouseX; //applying both rotations transform.localRotation = Quaternion.Euler(xRotation, YRotation, 0f); } } }

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