My Map has Disapeared

So Yesterday i have worked on my Private Map.
But Today i wanted to work on, but after i logged in my Map was just gone.

I think there was recently an Update but idk.
I had done very much on this map so its very hard for me redoing everything.

Edit: I have an Tab from Yesterday but its the only way to go there,
If i try open my map on a New Tab its not there.

Can you describe what you mean by a “private map”? What web site were you on? All edits to OpenStreetMap are public and visible to everyone, and your account shows no edits.