Any time a line of text is longer than the window size, it puts a line break between the person’s name and their entire message.
In the example above, the first “aaaaaa” is the same length on both lines. But the “aaaaaa” could fit on the first line, with the name, rather than being dragged onto the second line, ie:
The_T113: aaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa