Disappearing Graph View and Vault deletion

Dear Forumites,
I have found that the graph view is no longer functioning, as the tags either don’t appear at all when I press on graph view, or they only appear momentarily and disappear. Additionally, I have somehow deleted an old vault of mine, despite somehow accidentally opening another vault called Documents which seems to possess files comprised of documents from my documents folder. Furthermore, before i deleted my old vault, I tried to open it only to find that I was barred from doing so because of a pop-up that told me that I wasn’t able to open the folder. I have no idea what caused this mess. This is all very surreal. Help would be appreciated.