huuduy216 could you give the step-by-step recap of what you did to end up with the screenshot view? Does it happen before or after composing the discussion/post? I'm assuming the screenshot won't be the same for discussion and reply. I suppose here it was a new discussion, since it would be odd to be returned to the discussion list after creating a reply.
The blue backdrop must be caused by the Composer's backdrop, which is only used on mobile and not on desktop.
It's possible a javascript error could cause the screen to freeze after the composer closes but before the backdrop gets removed. This would also explain why the browser isn't redirected to the new discussion.
Does the issue happen at all on desktop? It would be a lot easier to access the javascript error message if it happened on desktop. What browser does this issue happen on? Name (seems to be Chrome) + version + operating system (seems to be Android). Does it happen with other mobile browsers?