Are you able to provide a screenshot of this for reference?
The system is set up to be ATO-compliant so it should definitely be nil if you have paid your employee at least $450 in the calendar month.
There could be something hiding in plain site that we are missing so having a visual reference would help immensely.
Look forward to hearing from you!
It looks like the system is behaving correctly in this screenshot - according to this article from the ATO, the threshold means that anything underneath that amount does not accrue super, but if you pay an employee $450 or more (before tax) in a calendar month, the super will begin to calculate. The settings in that pay run indicate that the earnings have just reached the threshold, so according to the ATO guidelines the super amount works out to be $42.75, and the SGC amount is correct.
If you want to adjust the Super amount, you can go to the green Actions button in that employee's earnings screen and select Adjust Super, and record any changes required.