Do you know what causes that or are you able to reproduce it?

Do you remember what were you doing before going to GWD?

I think i've seen something similar to this before with the pvp points counter (icon thingy). Seems to be when standing in an area where there is an interface of some sort overlaying the screen, if your client disconnects and manages to recover from the disconnect, the interfaces aren't loaded up properly.

I'm guessing if this issue were to appear again, it would be fixed by relogging.

Will be fixed, thanks.