Sorry for a bit strange title of topic, I had really no idea how to call it.
I have codepen example so I guess this would be enough to undestand what issue I have.
If you try to go fast over the anchors, at specific moment you will see the two images instead one. Basically the jQuery incject style attribute display: list-item; on two li elements, instead only one (IDK why)
If you go slow over items, it would work correctly, so active element would have display: list-item, remain two, would have display: none;