Strange message at the top of my website

I have a website that was built in CodeIgniter 3.x and Bootstrap 3.
Suddenly, on one of my pages, I have a strange message right below the navbar:

Code:

Type=cdir;Modify=20190228205608;Unique=04c800e5ee99c7bc;Perm=cmpdfe;UNIX.mode=0755;UNIX.owner=1998957;UNIX.group=1101; . Type=pdir;Modify=20190228205608;Unique=04c800e5e4dbe742;Perm=cmpdfe;UNIX.mode=0755;UNIX.owner=1998957;UNIX.group=1101; ..

It's nowhere in my own code. Not in my controller and not in my views. Where is this coming from?