Front page slider skipping slides

Hi, I saw this issue raised in another ticket but the author of the concern didn't pursue it to a final resolution. I have created 5 slides for my front page slider. If the slider is allowed to cycle through the 5 slides on its own, then it doesn't skip any slides. But if the viewer advances the slider with the arrow, then the slider skips a slide with each click on the arrow. Is there a CSS fix for this? My site is: www.icap2050.org/proposal. Thanks, Todd