You set your alert to rearm to 15-days, this means once the alarm has fired it will wait for 15-days until it will send another signal, you can find out more in the user guide below. Change the value to 5-minutes.
What Does The Re-Arming Feature Do?
The MACD may signal a bullish or bearish signal many times over a period of time, so to prevent you from receiving multiple alerts or opening many positions, you can set a time delay to wait until it starts to monitor for signals again.