Blog content overlaps sticky header

Hi. I made “header” sticky and it works well. However, I use the Elementor premium blog widget to display blog images and excerpts on the home page (see link). The excerpts overlap the header on scrolling. I set the Z-Index up to 99999. Interestingly, when I am logged in as administrator, this does not happen! It’s only when viewing as a typical user that the problem happens. Happens in Chrome and MS Edge. Suggestions? Thanks!

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