The SceneObject scripts are located in MMOCoreORB/src/server/zone/objects/scene. If you're a light modder to the source code of the server, then you may have edited it to add the additional rotational functionality. (Yaw/pitch/roll, etc).
If you made no changes to the server's source code, then it is most likely something to do with an individual object, or it's an issue that one of the developers accidently created. You can check to see if it was a developer issue by checking their gerrit and seeing what recent updates edited SceneObjectImplementation.cpp
Unfortunately, that's the end of my knowledge on this particular subject. If the problem persists and you're not able to reverse changes, someone more experienced on this forum might be able to help solve the issue.