Trying to browse back to "Epic Projects" doubles everything

Any solution for this?

I failed to save map from content example in to a new project.

Failed to save map C:/Users//Documents/Unreal Projects/NewProject/Content/Maps/Math_Hall.umap File is not in any of following content folders: C:/Program Files/Unreal Engine/4.3/Engine/Content/ C:/Users//Documents/Unreal Projects/ContentExamples/Content/ C:/Program Files/Unreal Engine/4.3/Engine/Plugins/Experimental/Paper2D/Content/

Well my path is: C:\Users\Documents\Unreal Projects\NewProject\Content\Maps

Slash (/ ) this in opposite direction, is that problem?

Thanks for your help