After trace you may see no trace show up this is caused by in completion of tracing process on the tracer.
Open Inspect on the browser and go to Network tab. you'll see the trace return data from Opticare Trace Server is somethingng like this:
https://opticare.com.au/order/timg.php?s=2&x=17652475976791765247597679&t=0_0_0_0_0_0_2100_0FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01FF01
Fix:
follow the correct tracking process on the tracer.