Why does my h1 text follow vertical page scroll when viewed from a link within LinkedIn on mobile?

  css, javascript, linkedin

I have a link on a LinkedIn page, but when you click this (on mobile), the text at the top follows the page down. This doesn’t happen when viewed in browser. Just the LinkedIn mobile app. Is this anything to do with the url parameters (?utm_source=linkedin…) that are added? I’ve tried absolute positioning the text, but it acts like it’s fixed. Any ideas? I’ve put a couple of simple pictures below to show what’s happening

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