We did a Snorbolax run and then one of the party members left... We were just chilling and chatting in Mooncraft Manor until we decided to exit but at the exact time a fellow guild member joined our party Bachnessmonster stepped on the elevator and it glitched...
That happened to me once, right at the start of my First Snarby run, the person i joined was on the lift, but I came in at the regular point, it fixed itself after a couple minutes XD .
-EL