When typing a command that prints multiple lines back, such as /help, it prints it back line by line, but multiple times. Therefore, typing help looks really bad because of how it prints multiple times. This also occurs with 3rd party commands from servers. The screenshots probably do a better job explaining.

Example when printing multi line command:
line1
line1
line2
line1
line2
line3
line1
line2
line3
line4
etc.