Google font 'Droid Serif' not showing as it should

I have set the headline on my homepage in the Google font ‘Droid’ Serif’. However, it looks nothing like it on screen. Can anyone help please. https://www.seymourcreative.co.uk. The sentence i’m looking at is the on that starts ‘We’re a Brand & Design Agency….” All help greatly appreciated. I have a screenshot of the particular bit of code. cheers, pete.