Map won't render completely

I uploaded my map but only a small part of it rendered. Not even the spawn point rendered. Here is the link: https://web.archive.org/web/2020/http://www.minecraftworldmap.com/worlds/...503/-3/0/0

Do you have any mods installed for this world?

I've seen this occasionally and the last time I checked into it, there was some corruption in the region files although this may not be the case here.

There are no mods on it.