The following page on my site is very jumpy. Scroll to the bottom and the page jumps around. It scrolls up and down on its own. I disabled the before and after plugin to see if the plugin was causing the problem and wasn’t. It still jumped around when I did not have the plugin active on this page.
May i know what kind of browser that you use when check those page and see those problem? Because those page just work fine on my side. I tested with chrome, firefox and safari as well and i think that you mean is the parallax effect, right?