Galaxy S5 stock browser user agent

I have a problem with a site not detecting a stock S5 browser as mobile. I don't own a galaxy S5 so I asked the person who found this issue to send me the complete user agent string, this is what I got: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.94 Safari/537.36 does the S5 browser really not identify itself as running on an android device? Might this be the result of some custom setting (which I'm told never happened)? How else can I identify the S5 browser as being a mobile device?