Since the Visual Portfolio v2.3.0 you may see that overlays display scrollbars when overlay content is overflowed. We need to show these scrollbars to make content properly accessible.
But if you don’t like this behavior and want to hide content and scrollbar, you can use this custom CSS:
.vp-portfolio .vp-portfolio__items .vp-portfolio__item-meta,
.vp-portfolio .vp-portfolio__items .vp-portfolio__item-meta-wrap {
overflow: hidden;
}