There's a little plus sign in my assets. Is something wrong?

There’s a little plus sign in my assets. Is something wrong? I attached an image for you to see121110-screen-shot-2018-07-18-at-60834-pm.png

Did you enable Collab or Cloud Build? The + means the asset or folder is new and needs to be commited to the file repository (Collab).

Oh wait it’s somehow gone now. I still want to know what caused this though.