As Windows can not handle two folders with the same name, but RushFiles can (and the Mac) the pc client will, rename the second folder with a timestamp on it. that is the "wierd" name.
To rename it go to the pc client and rename it on the folder list. The names on the client can be renamed locally. And renaming it on the server afterwards will not change the local "renamed" name. as it will break links.
Imagine two Companies on your system, that both share to the same person and both use a share called "Projects" then the user can rename it to "companyA Projects" and "companyB Projects", then all links on the pc will be set to these paths. Then if the Company renames it to something else it will stay as companyA Projects, on the local pc, so the links dont get broken. That is why the name stays.