Mobile portal latest posts align is wrong.
Is this what you're referring to?

https://mybb.jsoltesz.com/mybb-1.9/thread-74.html

If so it's already been reported.
jsoltesz.com - MyBB lead designer and team member since 2006
No response so I'm declaring this as a duplicate.
jsoltesz.com - MyBB lead designer and team member since 2006