You can re-create the issue by scrolling through the slides. After you reach the final slide and continue right to the first slide, there is a thin line on the left of the slide.
Screen Shot 2021-03-10 at 5.14.01 PM|122x500
Here is my site Read-Only: https://preview.webflow.com/preview/found-north-v2?utm_medium=preview_link&utm_source=designer&utm_content=found-north-v2&preview=57ec24384c5a903472b8979b96b8fc98&pageId=604937bdeb306065400160b4&mode=preview!