You have to make it the right size, danpost doesn't necessarily know the size needed. You're using a little bit of the world, so make the world the same size as the amount of space your using now.
Try updating it again -- this time lock the scenario (check the 'Lock scenario' checkbox). Maybe that will fix the size of the world (possibly a bug when scenario is not locked).
A new version of this scenario was uploaded on 2016-11-26 19:19:25 UTC
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