Kicked from Icecrown queue

I was afk and was waiting patiently for the queue but suddenly i went to get something to eat and when i come back i was removed from the queue. i asked my family and they said no one touched the computer. i was close to 1000 but now im 1153
Why is this happening

Depends on how long you were away from. For example if you are 1100 and then few minutes later found yourself in 1153, 3 normal people and 56 premium members might have logged in therefore queue is 1100-3+56=1153.