I just had a look and the buttons seem to be working fine for me. Maybe try a no-cache reload of the site. Ctrl-F5 is common for most browsers to do this.

Or try a different browser, to check to see if it's a problem with the site or just with a cached version.

Or, maybe I don't quite understand what the problem is. If it persists you could send a screenshot to admin@e-voice.org.uk showing the problem.

Thanks

Joe