Lockscreen stopped working, goes straight to homescreen

I have the swipe lockscreen. My tablet no longer locks and makes me swipe. Ill press the sleep button and if i press it again it should ahow me the swipe lockscreen instead it goes straight to my home screen. Also, if i get a notification it just opens right up to my homescreen. When i look in my settings, swipe is still selected but WHY is it not working?