The primary tabs are not visually aligned on the left with other elements when the first tab is not active. This only affects the default state because the default state doesn't have any border or background.
Let's consider updating the design so that the default state looks visually aligned on the left with other elements.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
If I read this correctly #6 is saying this is working as designed. And there hasn't been confirmation that this is a problem from anyone else, therefore closing.