Firebug: nested <strong> tags

Here's the screenshot of my firebug installed in updated firefox. I've noticed that the firebug shows hidden nested ta开发者_JAVA技巧g in the html tab. I don't know what causes this to happen...

Anyone?..Please help....Thanks...

And here's the html mark-up..

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You most likely have invalid markup which may include extraneous opening tags or extraneous closing tags. Pay attention to inline elements that may contain block levels, which isn't allowed.

I would validate your HTML because the width attribute is an indication that the markup isn't the best it could be.