Why Do I end up in a different dungeon from the one I sign up for?

[Penthea]

I am a level 34 archer. I go to the dungeons tab on the duty finder and select "Brayflox's Longstop". The first time I tried this, I ended up at Tam Tara. I tried again and this time I ended up at Coperbell Mines.

Why does this happen?

Is there anyway to go to the dungeon I select?

Make sure you only have one dungeon selected at a time. It's a common mistake for players, even those who have been playing for a long time, to forget to unselect other dungeons they had already queued for. When you're queueing the duty finder queue on the right side of the screen lists the content you're queuing for. If you're queueing for more than one thing, it will say so.