At the time Amazon turned on Cloud Collections they turned off collections importing on all your other devices. Whatever your collections were at that time will be what will be uploaded to any new Cloud Collections devices that you add to your account. This is only done the first time you add a device, but it is done on all new devices.
For some this can be quite frustrating because their servers retains any and all collections on your account from the time they first implemented collections. And a CS Rep told me at this time there is no way to get rid of them from their servers.
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