Friends, who is good at math?
What is the probability that, given 144 pizza options, 5 users from one local section vote for 5 identical pizzas, placing votes in the same order?
You don't have to be very good at math to realize that the probability is low.
Now, it is a very strange combination of factors, which could give the impression that votes were combined or copied between everyone. Prove this? Difficult if it was done in MP, if it was done in some topic in the local section, it will be "easier". But, they may not have even been combined, and it was just a joint action for the sake of friendship/pride or just to 100% support local pizzas. So they simply followed the vote of the first local member.
Anyway, something strange... and regrettable if it really was a combination.