1. If you turn on 4 zones at the same time, chances are due to network traffic issues some of the remote commands may be lost. That’s why the firmware has a feature that periodically refreshes the command to make sure the remote is in sync with the master. If you can stagger the simultaneous zones that would improve the situation.
2. This is expected: once a controller is set as Remote, you are NOT supposed to turn zones on or off on the remote controller — the communication from master to remote is one-way, the Master controller cannot see changes you made on the Remote controller directly.