Uploaded World Doesn't Have Buildings

Hello,

I have a world on my computer and I decided to upload it to my server. It went smooth, without any errors. When I started the server and logged in, the map is empty, withour any buildings, that me and my friends have created. I can still go on my world on singleplayer and it has buildings in it. I have no idea what went wrong, so please, if anyone know what I can do, I'd be grateful. Also sorry for my English, not my native.

Thanks.

Thank you so much. Everything works