Nav Span Style Error

For some reason my navigation now shows some code and a mouse over saying “span style=”

I was trying to change the colour of the page title … which I failed to do, so I reverted the change I made which was only a colour code on the style css.

You can see the issue on the index page on the “US property FAQs” & “Gallery” page titles.

http://greendoorinvestments.co.uk/making-money-with-property/

I can see what the problem is when I view the page source, I just have no idea how to change it!

The code for the bad titles is:
US Property FAQs</span>”><span style=”color:#59D30B;”>US Property FAQs</span><li class=”page_item page-item-21″>

When it should be:
<span style=”color:#59D30B;”>US Property FAQs</span><li class=”page_item page-item-21″>

Any help fixing this is appreciated.