Integrating 1 Arduino Uno, 2 Bluetooth modules, 2 phones with one Blynk app interface

You have to look at the blocking problem in your remaining hidden code, for example

if(PresetLightSelection==1){

      PresetLightSettings();
        
  }

Only you who hold the key and know where to find the bug. I’m afraid many people as well as I won’t have any more idea to share. That’s it.

You can also have a look at (for ESP8266 and ESP32)