Umbraco css folder always modifying files in background without me touching them

I have a GIT repository and I'm using Umbraco. Once strange thing that was happening to me were my files in the css folder kept on being modified even though I wasn't changing them. So every time I wanted to commit a change I'd have to undo the css file changes.

I thought this was Umbraco and because I had my style sheet linked to the rich text editor datatype, but it turned out to be the uSync package. I was synchronizing Stylesheets so by turning this off in the uSyncSettings.config file this stopped the problem. I don't need uSync to manage these files for me.

How do you programtically add a stylesheet link with .NET

This is how you add a stylesheet link programatically:

HtmlLink newStyleSheet = new HtmlLink();

newStyleSheet.Href = "your.css";

newStyleSheet.Attributes.Add("type", "text/css");

newStyleSheet.Attributes.Add("rel", "stylesheet");

newStyleSheet.Attributes.Add("media", "screen");

Page.Header.Controls.Add(newStyleSheet);