Some files appear twice in the Unity Dash search although they only exist once on my file system. Does anyone know why this happens?
You actually have 2 copies of that document. You can confirm this by opening a terminal with CtrlAltT and issuing the command
find . -name "Timer?Time?Tracker.ods" The reason I'm using
? instead of spaces in the find command is in case you somehow ended up with non-printing characters in the filename.
right-click on either of the icons in your first image, it'll tell you where the file(s) are located. You probably have the same file stored in two different places.