An image tells enough:
It happends on i-devices plus big variety andoids, but situation of desktops I don’t know.
This is not a major nor even minor issue. It is just a bit annoying one 
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What are the steps that lead to this screen? Just normal navigation?
Yes, just opening a topic, nothing fancy or strange.
Can you link a topic where it happens? I don’t encounter the issue on my android device.
Actually, I can repro on Chrome, I see the same thing as you, but only when tabbing to a user with a shield icon:
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You are way better with Discouse than I’m ever. Can you find a topic where some has answered? And hopefully is the newest too, because that is the situation normally.
And I (and my users) are using tabbing to clear that. So can it be kind of focus question?
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Yes, it’s a focus question. Slightly related to Discourse with a screen reader - #146 by pmusaraj – will keep this minor issue in mind as I work on a fix for that.
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I see this occasionally when just switching between multiple forum tabs (not the same forum, but I’m not sure if that matters), I don’t recall this happening before though, so it’s a recent issue.
Did you accidentally highlight the empty space?
Nope, just switched between tabs. Nothing more than that.
It is inconsistent on when it happens, but it does happen.
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I’ve been noticing this a lot lately on desktop.
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