From the event log when pressing button #7:
Lutron RRA2/Caséta Debug Received a keypad button/LED status message: GNET> ~DEVICE,16,7,3
Lutron RRA2/Caséta Debug buttonTriggerCheck: deviceID: 16, componentID: 7, gatewayID: 68394
Lutron RRA2/Caséta Debug Received: Dimmer 1 k - Dimmer 76 - stove&sink level set to 0.0
Lutron RRA2/Caséta Debug Received: Dimmer 1 k - Dimmer 79 - uCab N level set to 0.0
Lutron RRA2/Caséta Debug Received: Dimmer 1 k - Dimmer 88 - table level set to 0.0
Lutron RRA2/Caséta Debug Received: Switch 1 k - Dimmer 37 - uCab S turned Off
Lutron RRA2/Caséta Debug buttonMultiPressCheck: Timeout reached for keypadid = 68394:16.7, presses = 1
There is no LED for 7 in the device list.