Not sure it anyone has noticed the orange pending zap indicator yet. This means it got a payment confirmation from the NWC relay (payment was sent) but it hasnβt seen a zap yet. This can happen with slow or buggy zappers. But rest assured the payment was sent, damus tracks this in the UI so you donβt accidentally zap again.
Yellow means it didnβt receive a payment confirmation yet (nwc relay connectivity issue?)
The zap will disappear when NWC payment fails, which may happen if you ran out of sats or liquidity issues.
The indicator will go away when it sees a zap. 
