I just received an order from a customer that is identical to an order she placed a month ago. For some reason Shopify automatically caluclated the taxes differently. Specifically, the customer resides in Brooklyn, where the store is. Shopify correctly charged the correct taxes for a Brooklyn address - 4% for State, 4.875% for Kings County. However the most recent order was charged the 4% State and 4% "Brooklyn Municipal Tax".