Hummingbirds are very territorial..I have seen 10 birds trying to get at one feeder..when there are other feeders just alike nearby. Others(male) stake out one feeder as "theirs" and attack any hummingbird that attempts to feed from it.
Your so lucky! I keep trying to attract Hummingbirds to the yard. This year I will have another area totally away from the other feeders. I hope to get some or one! It's frustrating changing that sugar water for no visitors. I only saw one once at the feeder. That Hummer was just passing through.