Mobile Display Issue with Timeline7 Grid View and z-index 설정

Hi! I have this weird problem: When I use Timeline7 in a grid view with text above the timeline on desktop, it works fine. However, on mobile, I always get this view when scrolling up. The z-index is set to 2, and the background is also set. Here is my read-only link: https://preview.webflow.com/preview/cospiani-9ed2b5?utm_medium=preview_link&utm_source=designer&utm_content=cospiani-9ed2b5&preview=da48e998d1c76bc114a05262b3cc56cc&pageId=672619409c3209d9db883f2d&workflow=sitePreview. Thanks for your help!