Airport allows deleted MAC addresses on network

Am I misunderstanding Airport Security and timed access? I've deleted Mac addresses from devices previously on my network, but the devices are still able to join the Airport network again. (I have not changed the password.) I thought this set up required the device to be "on the list" in order to share the network. Is it only about the password?
Thanks for any advice.

Timed Access can be a bit tricky.
It helps to remember that the default under Timed Access will allow all devices unlimited access to the network. Double click on the default setting and a window will open with more details.
If you want to restrict this to certain devices, you must first change the default "rule" to not allow any access.
Then, list each device separately that you want to connect along with the "rule" or allowed connection times for that device.

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