tak,
I'm seeing the same thing except the defaultMaxwellGlobals node has the correct settings - the others defaultMaxwellGlobals1, 2, 3, 4 are not correct. This is when loading the scene after the mayall plugin is loaded.
I deleted the extra nodes (1,2,3,4) and saved the scene, then closed Maya. I then reopened the scene without loading the plugin and an extra node, defaultMaxwellGlobals1, was created. Now defaultMaxwellGlobals1 has the correct settings.
Looks like we are in agreement when you load the scene without loading the plugin first