The Gossip-mongers

I was waiting for a lift up at my block of flats. There was a man, with two women already waiting at the lift. The two women looked seemingly similar in looks (it's very difficult to determined whether they were twins due to both of them looking like they were in their late 30s/early 40s).

Lift comes, the four of us enter the lift. I was the last to enter the lift (hence I was standing at the door). I pressed my floor, they pressed for the 9th storey.

From the way they conversed, it was obvious they were working colleagues. They talked in standard English, about their life and recent happenings, which I've already forgotten.

Lift arrives at 9th storey, door opens. I stand to one side.

Pause.

Nobody gets out.

I press the button for the doors to close.

Reaching my destination, I got out of the lift, leaving the weird people behind in the lift.

What's wrong with them.

PS: If there were no more buttons pressed, the lift would supposedly stay on the current floor, until somebody else from the outside, presses the lift button.