This is due to bad web design from our (Project-GC's) part. This is a message, which isn't very clear. You can remove it by clicking the X to the right.
I can also assume that you have gotten three message, with slightly different words in them. They are all safe to remove, they were just to inform you.
At some point, it will be redesigned. You are definitely not the only who hasn't understood it. It's very clear for us that it's a bad design that isn't understandable.