One thing to keep in mind: the switch, as in a sensor, should be connected between SN1 (or SN2) and GND, not VIN, or COM. This is explained in the OSPi user manual.
https://openthings.freshdesk.com/support/solutions/articles/5000631606-user-manual-opensprinkler-pi-ospi-
If the switch is connected incorrectly, it could be triggering the program to run unexpected.