One of my staff posted an article, and I noticed that the text was blowing off to the left of the page. I found that a string of underscores that weren't line-wrapping was causing this.
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The article previews that are two-across line-break properly. But in the one-across preview for the most recent article, this is what happens:
[ATTACH=full]241139[/ATTACH]
Copying the same post a few times, the two-across preview wraps properly:
[ATTACH=full]241140[/ATTACH]
This happens even with a clean XF default style, and also happens in our third-party style the same way. If I narrow my browser on the desktop, though, where the article previews are presented singly, it works properly.