This is normal. It usually occurs when you try to share the top branch of a file or folder... Like sharing C: drive, or the Windows folder..

Each of those have multiple subfolders.. for some strange reason, MS makes you share each subfolder individually to gain full read and write access...

It has happened to me many times.. and I hate having to individually share each sub folder... but it was the only way that I figured out how to solve this issue... perhaps someone else can provide a better solution, but for now, try sharing all subfolders individually.