Those files are normal, but usually you shouldn't be able to see them. The best thing to do is to open your File Explorer options and tell it not to show hidden files.
While you're working on a file, all your changes and edits are actually going into that temporary file. Then when you press the Save button, the original "real" file gets deleted and the temporary file gets saved as the same name (so fast you don't even see it happen, but that's technically what happens).