Server without creatures

Hi,

I'm currently starting a server and i have a big issue. I can't see creatures, i don't know if they are here and invisibles or if they just don't appear on the map. The only one i can see is the bear at the king's throne on Stormwall.

Is there something to configure, is it a bug on my version or something else ? I'm using a legit alpha 18 game so i don't know from where it is coming.

Thank you in advance.