problem word-spacing of Title Tags with Firefox

Hi,
I noticed that if I look at my site with Firefox (15.0.1), the words in my Title Tags (h1, h2, h3, h4, h5) seems to stick all together : it looks like if there were no space between the words !
Using GChrome or IE8, it works fine.
Is it only me, or did others noticed it too ?
Thanks

Hi

If you are using a different type font used on our demo, probably this might happen.
Nevertheless, if you want help we would need to see your website running.

Cheers

I don't think I changed the demo font for the Title Tags.
I am still using the Oswald from Google font

It's from your side because seams perfect comparing Chrome with FF.
Can you show me your website running?

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