Having an issue

Hi

I’m having an issue with this but only on Firefox. A rectangle section is removed from the top right of each successive item I scroll through. If I click where the text should be it appears. I have uploaded a screen cast of the problem here https://www.dropbox.com/s/bjxhr9wl9nn1sea/quick%20view.wmv?dl=0

Cheers
Will

The page I need help with: [log in to see the link]