The apps simply send the trigger times to the device and the control for the camera and flashes is fully contained in the device. This means, or would indicate, the issue is with the data the device is getting from the app.
Since the dropController works if you use the usb connection I suspect you have the wrong Android app.
Since you built the device sometime ago I presume you are using version 2. The app for this can be downloaded from the playstore.
In the version 3 app I changed how some of the control codes work so it is not fully compatible with the version 2 hardware.