There is a problem with ProtocolLib. The problem is only in version 5.0.0 or above but there is no problem in version 4.8.0.
Details: Server 1.8 & Java 8

The problem: The message lines are buggy in the chat. The lines are completely messy.
Example, I have an auto-message that will do this:
Hello!
How are you?
What do you do?

The lines bug will do like this:
What do you do?
How are you?
Hello!

Screens :
Real message :

Bug message with ProtocolLib 5.0.0 or + :