Made a photo contest poll but the voting button is invisible

Customized the voting as 'yes' which should appear as a sliding rectangle but the finished poll does not show any rectangles. However you know the button is there because when you hover over the white preview border or the slideshow black, you notice your mouse changing to a 'finger' and you can click. Can someone please help?

Hi Tiffany,
Sorry, but I don't understand the problem. Can you please send a screenshot and a link to your poll to support@pollunit.com?
Thank you