Ultimate member private message plugin fix

Dear WordPress developers,

I have a website using the ultimate member private plugin for private messaging between members of the site. However the messaging system appears to be buggy. When you click the chat message button on a user’s profile. the message does not appear until you close the chat window and reopen it and after that you can start chatting normally again.

Please i need help with this. I.d prefer someone who has experience working with ultimate member plugin.

Kind regards