Font appears differently in other browser

Hi,
I chose the google font “Questrail” for our website. But somehow the font appears so different in mobile version in chrome (but in PC shows fine) and other browser *(for example safari and Firefox shows different font too)

Do you have any idea what cause it and how can i fix it?

http://web1027.login-14.loginserver.ch/cms/

Thank you very much
Anita