Getting an entire list of them takes time. Try narrowing your search down to only channels that contain a certain word in the title or the topic. Or only list channels that have at least 3 people in them but less than 20. It is a delay between what you type and what others see. Servers have a lot to do, and you are just one of possibly thousands of people using that server.
Chances are, they misspell things too.
In fact, misspelling words has risen to an artform on IRC, and some people are experts at it. I don't make that much noise when I type. Those people are Channel Operators, and they maintain order and control on the channel. They keep arguments to a minimal level, and keep downright nasty people off the channels.