Instance issue
 

We have progression raid zones instanced.

The 0 version of the Sleepers tomb instance works perfectly. However the > 0 verions of the ST instance seems to have some weird issue. Namely, the Prismatic Dragon models (The Sleeper, and a custom npc with same race id)showing as human model , and the warders aren't poping at all.
Once again, version 0 of the ST instance is perfect, The Sleeper is showing properly, and warders pop/repop correctly.

Any help would be appreciated.

I like to add that Other zones made into instances- like TOV, PoAir etc - do not have this problem.