Issue Description: Dynmap markers isn't correct in surface.

Dynmap Version: dynmap-3.1-spigot
Server Version: catserver 1.12.2
Markers-mod : Landlord-Dynmap, Worldguard

Hello my spawn marker, Landlord-Dynmap marker, playermarkers and worldguard marker isn't place correctly in surface mod :
in flat :

in surface :

This issue belongs on the LandLord-Dynmap issue tracker as it is an issue with it, not with Dynmap https://github.com/LandlordPlugin/LandLordMap