Sidebar widgets not showing anymore

Hi, I tried to add a Twitter widget to my sidebar. Not only does the Twitter widget not show, a disclaimer, two buttons and three ads also mysteriously disappeared from the sidebar now. I just can’t seem to fix this. It all shows in the widget area of my dashboard but not on my website. It is not a browser problem as I have refreshed it, and also I have the same problem on my phone. Can someone please help quite urgently?