Seem find to me. Nothing wrong. Unless if you are changing spawner type or other. the /spawner is wrong since it is /mobspawner. I found that out yesterday when I spend 2 days trying to find out how to change spawner type.
Found out there was a slight delay with my rank upgrade lol. Will someone fix the /command on that rank website?
Your rank can take 1 second to deliver or even take 24 hours to deliver. Please only inform us about it if you did not receive your rank after 1 day.