I very seriously doubt that the real path is as shown, because it looks to me like you are viewing the contents of a docker container, likely krusader. What you see there is NOT the actual server paths, only what is mapped in the container configuration.
I suspect what you are seeing is perfectly fine, but if you don't get your head around WHY you are seeing it that way, you are going to have a bad time if you try to interact with anything but the unraid_ folders in that view. It likely won't mess up your server, but you will be very confused about what you are seeing.
Think of that view as a separate computer, with the unraid flashdrive, shares, and unassigned devices connected to their respective folders. You are not seeing what is actually on the server root, you are seeing the "local computer" that is the docker container.
If you want to view and interact with the actual server, you need to use the console, either locally or logging in with ssh or the web gui terminal. Type mc at the prompt for a simple file manager. I'd recommend browsing around but not copying or especially moving files until you get more knowledge of what you are seeing.
It's much safer to interact with the shares over the network from your client machines, after all, Unraid is primarily a NAS, Network Attached Storage.