Firefox on 2 independant laptops, not reading website source code correctly, when all correct on Chrome and IE.

Rebuilt my website in Serif WebPlus X6.
Using Google Chrome or Internet Explorer the site is displayed correctly as is the source code.
In Firefox 18.0.1 Code is being read wrongly. Cleared Cache and fault still there. Checked in Wifes laptop – still the same fault on her Firefox and okay on Chrome and IE.

Code should read - span class="Body-C-C9">“Why won’t the doctors listen”?
But firefox is showing -      span class="Body-C-C9">“Why won’t the doctors listen”?</span></p>

There are further similar faults throughout the website.
Why is Firefox not reading the code correctly?
Please help.

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