Yeah, I've got it. I have been saving my documents to my free storage space in One Drive, and at the time, which is like a year and a half ago now, I guess I didn't realize the save button changed with the different 'save' location. There is a tool tip that shows when hovering on the icon; it says: "Save this document and refresh it with updates made by other authors". The part about 'other authors' wouldn't be available for a document strictly saved to the 'computer', therefore the 'refresh' symbol over the floppy disc icon, which are what the two arced arrows represent, wouldn't be necessary.

I'm all good with it now, though. Thanks for the belated reply, anyway.