Not obviously cast it when you move it? That's a ruling too. Nothing in the spell states that the curse is subtly cast when it's moved.
It's not a ruling. You aren't casting anything, subtly or otherwise, when you're moving the curse.
It's Eberron, not ebberon.
It's not high magic, it's wide magic.
And it's definitely not steampunk. The only time steam gets involved is when the fire and water elementals break loose.