Could be a conflict with jquery or something else on the page causing problems, if you goto your Centova's widgets section and click on the preview buton you can test that one out to verify it works as it should (usually does), sometimes you can just move the script to a different location on the page, or use jquery no conflict mode, but since your using Wordpress you may have problems doing that, I recommend trying first to disable plugins one by one by one and test to see which one (if any) is causing the problem