ELECTION DAY - Where Do I Vote

I received a notice from the Chicago Board of Elections that told me to vote at the Francis Parker School - 1st Floor Lobby. I got there, showed them my voter card and was given my ballot. No Problem. While I was voting I'd say 3 to 5 people were directed to other polling stations. Some were sent to the third floor of the building so that seems like an honest mistake. But at least one was sent to a station a couple blocks away. There seems to be a lot changing in polling stations. I don't know why this happens. I've seen it often when voting. One thing is for sure it frustrates and discourages those voters that are sent elsewhere.