A couple weeks ago, I got a private message, which was listed on my account as New (1) on the upper right corner, and on my account page it said my main account had an unread message as Asura.Geriond (1). However, my inbox was shown as empty, while the numbering was listed as "1-30 of 30".
I just got another PM that I can't see, so now it says I have two unread on both screens.