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?
Math: it depends. Are those 5 users the only ones from that local section, or is it a sub-section of all local users? Given enough people, similarities become more likely. Also: not all pizzas have the same chance of being picked: some are objectively better than others, so people are more likely to select certain pizzas. So I can't give you an exact answer based on math alone.
Gut feeling: this doesn't sound like a coincidence, it sounds like copy/pasting.