Appointments are displaying in the incorrect timezone

Appointments that we are scheduling through campaign forms are displaying in infusionsoft 13.5hrs behind the times input into the form. For example, an appointment we scheduled for 2pm on 11/6/20 is showing in the calendar at 12.30am on 11/6/20. Another example is an appointment scheduled for 10am on 22/6/20 and is displaying at 8.30pm on 21/6/20.

I have checked our Admin settings and they are displaying as GMT (+09:30) Adelaide, which is correct.

Could anyone suggest why this is happening? and how we can resolve it. It only began happening on 4/6/20.