Yes but a lot of the time conventional roshni’s do sync as all roshni’s play their tones (in this case medium sweep) at the same speed and at the same pitch all the time, so when the panel goes in to fire it sets them all to go at the same time so they usually don’t have any problems syncing. My guess is what’s happened here is the different sounders we can hear that are out of sync are either at completely different ends of the circuit or are on different sounder circuits and one of the sounder circuits stuttered when activated.
