Do not upload the worlds to the server

Hello! I am trying to upload a few worlds to my server, but when I enter the server after uploading them, they remain completely the same as how I left them before.

The worlds tht I'm trying to upload to the server would be these [ letslente.weebly.com/the-earth.html ], just would be all the worlds that appear in this section , except the first two. I want to put each continent in a different world , but what happens happens.

Any solution?

Spigot 1.12.2, but in my opinion, I do not think that's the problem, since the map of Africa does let me install it, it's the only one that has been able to upload well to the server

I'm sorry, I'm not English and I have to go using the google translator. What I mean is that there is a map that lets me upload to the server, which is Africa.