Fonts not working correctly in pages

Hello,

I have enabled Google Fonts in Highend Options > Font Settings
I have chosen Open Sans for all fonts (body, navigation, all headings, etc.)

In my case I need to use Latin extended font, so I have manually added this line before </head> in header.php file.
<link href='http://fonts.googleapis.com/css?family=Open+Sans:400italic,400,700,600|Open+Sans+Condensed:300,300italic,700&subset=latin,latin-ext' rel='stylesheet' type='text/css'>

Home page works fine.
But if I open any other page I have created, some characters are bold.
Why this is happening?

I’m getting this on Firefox 29.0.1.
On Opera 20.0.xxxx it works fine.
Please check screenshot.

As this is simple pages with simple text, I have not used Visual Composer, I used standard WordPress text editor.

Thanks,
M.