Moved devices from Cloud Management to Control, devices still show up in Cloud Management

I currently manage two sites with Alta gear. One managed in Cloud Management and one in Control.
The site managed by Control was initially managed by Cloud Management as well.

Since I moved the devices to Control, they still show up in Cloud Management.
I did remove them a couple of days ago and they showed up again. Is there a way to remove them permanently?

If they’re connected to your local controller, and you delete the devices from the cloud controller, they will not show up in the cloud controller any more.

Thanx! Will keep an eye out.