When the initial message will not display after registering/updating chatbot, please refresh the page of click [End chat] multiple times. If that does not change anything, it would be possible you are not updating online initial message.
When a customer started a chat, the message shown in that chat can be check in [Chat]>[Function]>[Initial message].
This is how you can check it.
(1) Click on the setting button on the upper right of the management page.
(2) Click on [Chat]>[Function]>[Initial message] on the left side of the screen.
(3) Check in [Initial message] and the choices below.