PhotonChat Behavior confusing

Im quite confuse how PhotonChat works

As in this screenshot

My pun peak CCU is 233
While my chat CCU peak is 456

I feel that the chat code is duplicating? PUN automatically disconnects for a certain time. does the chat disconnects too the same period the PUN disconnects?

And how can I disconnect Chat?
What is the code should I use.
this one:
or this one:

whats the difference?
pls help