Here is an issue I’ve come across a couple of times now when working with Mautic locally, so I thought I would document it in the forums in case anybody else experiences it.
The problem 
Mautic should not, by default, have /index.php/ in the URL anywhere. It ships with an htaccess file which should do all the rewriting without /index.php. I started seeing it popping up in my Mautic instances locally, and couldn’t figure out why.
Troubleshooting 
Usually a htaccess file deals with the /index.php/ rewriting, so that’s the first place to start.
When I was extracting the files and moving them to the appropriate folder (using the UI rather than command line, sometimes I’m lazy!) it turned out that I had not been moving hidden files.
.htaccess is a hidden file, and it wasn’t apparently moved over - it was missing from my Mautic directory. This meant my Mautic instance had no htaccess file, so nothing to do the URL writing - hence the behaviour I was seeing.
To view hidden files 
Windows: https://support.microsoft.com/en-gb/help/14201/windows-show-hidden-files
Mac: In Finder, press together Cmd + Shift + . (dot) to toggle on/off
Solution 
Simply copy the .htaccess file from the download, and paste it into your Mautic directory.
Now, navigate to your Mautic instance without the /index.php/ in the URL and all should be well.
Side note, you may need to manually clear your browser cache, sometimes it will cache URL.
You may also need to double check your configuration and remove /index.php/ from the URL if it is set like that from your installation.
Hopefully this should resolve the issue!