Sometimes it's just a visual glitch.
In the next time try to click in send and wait 2 to 3 minutes, then check the community (or click to see your posts in your account page) to see if the post is there.
DetailObserver
joined 1 year ago
Well, it is listed at https://lemmy.world/instances so it should work.
Maybe the servers were slow at the time you tried?
How cute! It's yours?