Project Open Problem

So I use a game that uses a type of multiplayer, and I usually open the same project in the unreal editor to use as a second player. But after I created a new button in my lobby widget, whenever I open up the second editor some of the buttons I had created before are just gone. I tried deleting the newly created button but it still reopened with nothing in the widget. I’m worried If i close down the current editor it will do the same and I will lose everything. Can someone help?