There are two points here. First, it is marked as read normally and becomes the same as other topics after being read:
Not yet read:
After reading:
In this field everything is fine, and it works as intended.
The second point is the font used in the title of the post. I still have to do some tests to confirm, but this depends on the type of keyboard or browser used by the creator of this topic. It could also be that he writes the text in Word, in a certain format, and then copies and pastes it there, ending up assuming that formatting.
But as I said, I went to do some tests and I'll come back later with more details (if I have time).
