"Changes not staged for commit" after cloning a repo on macOS

Hi everyone!

I encountered a strange situation on OS X recently. I cloned a repository (https://github.com/kevinxucs/Sublime-Gitignore.git), went to folder, and saw "Changes not staged for commit" message for four specific files. It happened every time I repeated the procedure. I even was able to commit those to the repo. At first I thought there's something wrong with repo, but I cloned it on Ubuntu 16.04 and everything was OK; no "Changes not staged for commit" message.

Does anyone have any idea?

Thank you.

Log:

``` $ git clone https://github.com/kevinxucs/Sublime-Gitignore.git Cloning into 'Sublime-Gitignore'... remote: Counting objects: 515, done. remote: Total 515 (delta 0), reused 0 (delta 0), pack-reused 515 Receiving objects: 100% (515/515), 102.14 KiB | 48.00 KiB/s, done. Resolving deltas: 100% (143/143), done. $ cd Sublime-Gitignore/ $ git status On branch master Your branch is up to date with 'origin/master'.

Changes not staged for commit:
   (use "git add <file>..." to update what will be committed)
   (use "git checkout -- <file>..." to discard changes in working directory)

     modified:   boilerplates/Nanoc.gitignore
     modified:   boilerplates/OpenCart.gitignore
     modified:   boilerplates/SASS.gitignore
     modified:   boilerplates/WordPress.gitignore

no changes added to commit (use "git add" and/or "git commit -a") ```

The rest of the log is available at https://github.com/kevinxucs/Sublime-Gitignore/issues/6. (I don't want this email to become too long.)