One thing you can try is to run the firmware in command line and see if there is any error message printed out. To do so, first follow instructions here:
https://openthings.freshdesk.com/solution/articles/5000631599-installing-and-updating-the-unified-firmware#stopall
to stop the firmware from running automatically. Then go to the folder where the firmware is installed (e.g. /home/pi/OpenSprinkler-Firmware), and run
sudo ./OpenSprinkler-Firmware
This will launch the firmware in command line, where you can see debugging messages. When you start a program or manually start a zone, see if there is any error message that could be related.