Void ark leave box in Diadem

Used the exit from Diadem top of map first on right from centre. Usual grey box asking if I want to leave I select Ok then another grey box appears asking if I want to elave void ark as picture below, selecting yes you do leave the instance but thought it was a little bug that creeped up unoticed. Happened on Tuesday around 12pm GMT on Phoenix server. Instance entered on our FC company lvl 50 airship with 6 persons in party at start. Co-ords 33,5.
http://imagizer.imageshack.us/v2/640...908/7BTsNn.jpg