Open the World Editor.
Go to the tab “Object Editor”.
There is a wrong setting for the doodad “Northrend Archway” in category “Structures”.
Instead of “Archway” the model for the “Orc Warlock” is used.
I believe this is because they have (almost) the same rawcode, only differing in uppercase/lowercase, and the game isn’t being case sensitive in checking what model to load 
No. It’s a wrong setting by default. The devs should fix this. 
well no, the doodad is set to use the right model (Doodads\Ruins\Structures\RuinsArchway0_\RuinsArchway0_)
however, the doodad’s FourCC object code is ‘NSra’ and the Stormreaver Apprentice (Default) unit’s FourCC object code is ‘nsra’, so the model is being pulled from the Stormreaver Apprentice (Default)'s data because, again, the game’s data checker or whatever isn’t case sensitive. Would be very good if it was fixed though, seems like a pretty big oversight.
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Hey, good found! 
Thank you very much for the additional information. 
Before Reforged was released, everything was set up right. It isn’t probably the end of the world, but yeah, ignoring this little thing isn’t a solution as well. 