Please check again now.
This probably happened because of your freaking world name, and might happen again due to this.
We recommend to keep the world name default if not really needed to change it
it's gone, thanks!
the reson i changed the name to that is to know what the world is. After 4 or so years of using aternos, i have a bunch of worlds named "world" from backing up- so it got confusing.
also had some with long names (but i've never had this problem before).
but thanks anyway, will keep it in mind!