Header Element Disappears during preview

Hi, I’ve been trying to add responsiveness to my web app. I was working on the header, putting elements into groups.

I thought I was doing everything correctly until all of a sudden when I try to run it, a group of elements just does not display. I checked over everything and I have no idea why it isn’t working. It shows in the Responsiveness panel but doesn’t show up in Preview.

Then it disappears in Preview. Please advise.

Thanks!

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