Case 1 : Right after accepting the quest.
(Attention to the blank line of the screen shot.)

Case 2 : I'm checked for the "Wrap Long Lines" option.
There is a phenomenon that overlaps with the following lines when the content to be displayed is long.

I can't see the error message.
Collapse and Expand to return normally.

Hmm. I thought I had fixed those issues. I will have to take another look at it. Potentially increment the timer, because if memory serves, I had to set a timer for updating to get the correct return values from certain API calls.

Screenshot of the header in the same situation as Case 1.
This may be due to background highlight.

The letters were long, but they didn't change to the next line.
Background highlight was a line seems to have come down.
On a similar issue, I have mentioned an issue concerning this one before. (Closed #58)
I have a hunch that, in conclusion, this issue has not yet been resolved.

I faced the same issue as case 2 repeatedly as I carried out the quest.
What I think is that the long letters must first secure an empty space and then come down to the next line, but there is no space, so it seems to have resulted in only the letters being divided by command.

The issue is that GetFontHeight() returns the incorrect value if called too soon. I need to go over my code to make sure more or less every size update call is run on a timer.