I think I know what’s happening. You are trying to operate O27 turnouts from a fixed supply. You have probably connected one of the ZW’s A-to-D terminals to one of the turnout terminals, the one closest to the switch machine if you’re using 1122 or 5122 turnouts. That terminal is connected internally inside the turnout to the outside rails. Without modifying the turnouts’ internal wiring, there is no way to power those turnouts from a fixed supply; they are designed to be powered only from the track.