UserAgent: Mozilla/5.0 (X11; CrOS x86_64 7978.74.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.103 Safari/537.36
Platform: Chomebook

Example URL:
http://www.golfscoring.net/css/facebook.css

Steps to reproduce the problem:
1. Open the page with Chrome and see the text that gets inserted at the top and bottom of the file

What is the expected behavior?
.signup_header {
  display: none;
  visibility: hidden;
}

What went wrong?
003a
.signup_header {
  display: none;
  visibility: hidden;
}

0

Does it occur on multiple sites: N/A

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes 

Chrome version: 50.0.2661.103  Channel: stable
OS Version: 7978.74.0
Flash Version: Shockwave Flash 21.0 r0

It was appearing seemingly randomly but now more and more users are reporting it.  I can only make this behavior happen with Chrome, not with Firefox, Safari, or a wget call.  The file on the server has not been touched for more than a year.

It only happened with the https link in the beginning but now even the http link has the issue.

https://www.golfscoring.net/css/facebook.css
http://www.golfscoring.net/css/facebook.css

It also happens with images like
http://www.golfscoring.net/images/gui/nav-open.jpg
and
http://www.golfscoring.net/images/gui/nav-close.jpg

again, sometimes over http but often over https.  I actually disabled mandatory https for the site because i thought that was only where it was occurring but now it's happening on http too.