I suggest taking a look at your html sanitization settings make sure html isn't allowed in markdown settings.
Next step would be to move the other 2 topics from that category and check if you still see broken markup.
It could be my browser, let me know if it's not displaying properly for you.
same thing here, on IE, FF and Chrome:
@pharok Thanks, I've opened a ticket https://github.com/NodeBB/nodebb-theme-persona/issues/120 but wanted to make sure I wasn't the only one seeing it.