Issues with the default "Featured Topics" widget.

[Choons]

Hello, I hope this is the right place for this question.

When I add the "Featured Topics" widget to my sidebar the links it adds are broken, and are also formatted strangely (the indentation is weird, text is always bold, etc.) which is different from all of the other widgets I've tried that display various forum topics.

Here's an example: https://gfycat.com/FocusedHoarseCobra

Any idea why this might be happening? We've barely changed anything from the vanilla package we installed.