Quote from Dave Voorhis on June 16, 2019, 8:26 am

As of a recent update and until now, there was a forum formatting quirk: Depending on what browser you use and the size of your browser window, the forum category and “last post” heading bars aligned with the edge of the browser window, but the subforum and last post summaries might not be aligned with the heading bars. Instead, they might be centred within roughly 50% of the browser window, particularly when it’s maximised. Reducing the size of the browser window could be used to bring them into alignment.

This has been corrected. Depending on what browser you use, you might need to clear your browser cache and reload the page to see it.