Maybe my estimates are inaccurate but I genuinely believe that for every low immortal queuing theres like 3 more ascendants queueing
so you realistically for the 9 other players in the lobby, each of them have like a 25% chance per player of them being immortal, which means you sometimes queue into full immortal lobbies but mostly queue into high ascendant lobbies
so like the odds of you getting a full immortal lobby are 0.25^9 = basically zero
the odds of you getting at least one immortal in your lobby are 1-(0.25^9) = almost certainly