In every incident, we noticed that SLA start after 2minutes of ticket open date/time. Why it just not start once ticket created.??
Check in Administration -> Options Manager -> set_sla_evt_open_date Option.
Check if is installed.
you would need to check the service type event "delay time"...I think you set it to 00:02:00. Please check. If this is true and you would like events start right away, set it to 00:00:00.