Sales Tax Collected for State Not Set Up

[phoenixmtn]

I noticed that during the third quarter, sales tax was charged on a sale where the customer's billing address was GA and the shipping address was SC. I only have sales tax set up for NC since I fall under the thresholds to collect for other states. I checked my options and NC is still the only state I have checked under my settings to collect for. What's going on with this order? Thanks!