Getting into saved dungeons

I queue into hc rdf, I kill a boss or two and then group disbands. I get out, I queue again and I get same dungeon with different people who I can't see now. Why would it send me back to the same dungeon that I'm locked in?
When I ask for kick, people want to report me and telling me to leave instead. Resulting me getting 30min deserter if I do.
Is this happening to anybody else? Has happened few times to me.

You know what you are describing here is a bug. Have you put it where it belongs?

Hence why I'm asking if it's happening a lot to others to make sure it's a bug but thanks for the useful information.

I've faced the same thing but when you relog and then que it won't happen